# Math | Mathematics homework help

SHORT ANSWER.  Write the expression or turn that best completes each assertion or answers the scrutiny.

Solve the bearing.

1)  A vague scantling of  700 lofty initiate seniors is ardent the SAT-V trial. The equalize reckoning for this scantling is  overbar(x) = 487. What can you say encircling the equalize reckoning m of all lofty initiate seniors? 1)  ______________

2)  The walk subject-matter middles for 10 vaguely separated scholars in a statistics rank delay 125 scholars are listed under. What can you say encircling the equalize reckoning m of all 125 scholars?

3.7     2.5     2.3     2.0     2.6     3.5     2.1     2.8     2.4     3.6 2)  ______________

3)  A real belief in season is  8.35 < m <  9.85. Find the scantling equalize  overbar(x) and the deception of venerate E. 3)  ______________

MULTIPLE CHOICE.  Choose the one choice that best completes the assertion or answers the scrutiny.

4)  Given the corresponding scantling statistics, which equalize of belief accomplish chattels the narrowest belief season? 4)  ________

A) 75% B)  85% C)  90% D)  95%

5)  The walk subject-matter middles for 10 vaguely separated scholars in a statistics rank delay 125 scholars are listed under.

2.0    3.2    1.8    2.9    0.9    4.0    3.3    2.9    3.6    0.8

What is the chattels on the width of the belief season if the scantling extent is increased to 20? 5)  ________

A) The width decreases.

B) The width increases.

C) The width dross the corresponding.

D) It is impracticable to calculate delayout over notice.

6)  Find the crucial treasure  _elementsubscript_element that corresponds to a  94% belief equalize. 6)  ________

A)  plusminus1.88 B)   plusminus1.645 C)   plusminus1.96 D)   plusminus2.33

7)  Determine the deception of venerate if the walk subject-matter middles for 10 vaguely separated scholars from a rank of 125 scholars has a equalize of  overbar(x) =  2.0. Assume the walk subject-matter middle of the 125 scholars has a equalize of m =  2.5. 7)  ________

A)  0.5 B)   2.25 C)  - 0.5 D)   1.75

8)  A vague scantling of  50 scholars has a trial reckoning middle delay a banner intermission of  11.4. Find the ultimatum deception of venerate if c =  0.98. 8)  ________

A)  3.76 B)   0.53 C)   1.61 D)   1.58

SHORT ANSWER.  Write the expression or turn that best completes each assertion or answers the scrutiny.

9)  In a modern consider of  71 eighth walkrs, the equalize calculate of hours per week that they watched television was  18.7 delay a banner intermission of  5.8 hours.

a) Find the  98% belief season of the equalize.

b) If the banner intermission is doubled to  11.6, what accomplish be the chattels on the belief season? 9)  ______________

MULTIPLE CHOICE.  Choose the one choice that best completes the assertion or answers the scrutiny.

10)  A vague scantling of 150 scholars has a walk subject-matter middle delay a equalize of 2.86 and delay a banner intermission of 0.78. Form the belief season for the population equalize, m, if c = 0.98. 10)  _______

A) (2.71, 3.01) B)  (2.51, 3.53) C)  (2.43, 3.79) D)  (2.31, 3.88)

11)  A vague scantling of 40 scholars has a trial reckoning delay  overbar(x) = 81.5 and s = 10.2. Form the belief season for the population equalize, m if c = 0.90. 11)  _______

A) (78.8, 84.2) B)  (51.8, 92.3) C)  (66.3, 89.1) D)  (71.8, 93.5)

12)  A vague scantling of 40 scholars has a equalize annual rights of \$3120 and a banner intermission of \$677. Form the belief season for the population equalize, m if c = 0.95. 12)  _______

A) (\$2910, \$3330) B)  (\$210, \$110)

C) (\$4812, \$5342) D)  (\$1987, \$2346)

13)  A vague scantling of 56 fluorescent easy bulbs has a equalize existence of 645 hours delay a banner intermission of 31 hours. Form a 95% belief season for the population equalize. 13)  _______

A) (636.9, 653.1) B)  (539.6, 551.2)

C) (112.0, 118.9) D)  (712.0, 768.0)

14)  A bunch of 49 vaguely separated scholars has a equalize age of 22.4 years delay a banner intermission of 3.8. Form a 98% belief season for the population equalize. 14)  _______

A) (21.1, 23.7) B)  (20.3, 24.5) C)  (19.8, 25.1) D)  (18.8, 26.3)

15)  A bunch of 40 bowlers showed that their middle reckoning was 192 delay a banner intermission of 8. Find the 95% belief season of the equalize reckoning of all bowlers. 15)  _______

A) (189.5, 194.5) B)  (186.5, 197.5)

C) (188.5, 195.6) D)  (187.3, 196.1)

16)  In a vague scantling of 60 computers, the equalize recover absorb was \$150 delay a banner intermission of \$36. Form a 99% belief season for the population equalize. 16)  _______

A) (\$138, \$162) B)   (\$18, \$54) C)  (\$238, \$274) D)  (\$537, \$654)

17)  In a modern consider of 42 eighth walkrs, the equalize calculate of hours per week that they watched television was 19.6 delay a banner intermission of 5.8 hours. Find the 98% belief season for the population equalize. 17)  _______

A) (17.5, 21.7) B)  (14.1, 23.2) C)  (18.3, 20.9) D)  (19.1, 20.4)

18)  In a scantling of 10 vaguely separated women, it was endow that their equalize tallness was 63.4 inches. From anterior studies, it is conjectured that the banner intermission, s, is 2.4. Form the 95% belief season for the population equalize. 18)  _______

A) (61.9, 64.9) B)  (58.1, 67.3) C)  (59.7, 66.5) D)  (60.8, 65.4)

SHORT ANSWER.  Write the expression or turn that best completes each assertion or answers the scrutiny.

19)  There were 800 math instructors at a mathematics cabinet. Forty instructors were vaguely separated and ardent an IQ trial. The reckonings chattelsd a equalize of 130 delay a banner intermission of 10. Find a 95% belief season for the equalize of the 800 instructors. Use the terminable population emendation ingredient. 19)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the assertion or answers the scrutiny.

20)  The banner IQ trial has a equalize of  97 and a banner intermission of  18. We absence to be  95% real that we are delayin  5 IQ subject-matters of the gentleman equalize. Indicate the required scantling extent. 20)  _______

A)  50 B)   8 C)   147 D)   1

21)  A protect at a national hospital is zealous in estimating the extraction impressiveness of infants. How big a scantling must she excellent if she desires to be  99% impudent that the gentleman equalize is delayin  3 ounces of the scantling equalize? The banner intermission of the extraction impressivenesss is known to be  8 ounces. 21)  _______

A)  48 B)   47 C)   7 D)   6

SHORT ANSWER.  Write the expression or turn that best completes each assertion or answers the scrutiny.

22)  In prescribe to set rates, an security corporation is hard to venerate the calculate of corrupt days that bountiful term workers at an auto recover treasury choose per year. A anterior consider implied that the banner intermission was  2.2 days. a) How big a scantling must be separated if the corporation absences to be  95% impudent that the gentleman equalize dissents from the scantling equalize by no over than 1 day? b) Repeat divorce (a) using a  98% belief season. Which equalize of belief requires a bigr scantling extent? Explain. 22)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the assertion or answers the scrutiny.

23)  Find the crucial treasure,  _elementsubscript_element for c = 0.99 and n = 10. 23)  _______

A) 3.250 B)  2.2821 C)  2.262 D)  1.833

24)  Find the crucial treasure,  _elementsubscript_element, for c = 0.95 and n = 16. 24)  _______

A) 2.131 B)  1.753 C)  2.602 D)  2.947

25)  Find the crucial treasure,  _elementsubscript_element, for c = 0.90 and n = 15. 25)  _______

A) 1.761 B)  1.345 C)  2.145 D)  2.624

26)  Find the treaunfailing of E, the ultimatum deception of venerate, for c = 0. 90, n = 16 and s =  2.3. 26)  _______

A)  1.01 B)   0.25 C)   0.77 D)   0.19

27)  Find the treaunfailing of E, the ultimatum deception of venerate, for c = 0. 99, n = 10 and s =  3.8. 27)  _______

A)  3.91 B)   3.39 C)   1.23 D)   3.81

28)  Find the treaunfailing of E, the ultimatum deception of venerate, for c = 0. 99, n = 15 and s =  5.1. 28)  _______

A)  3.92 B)   4.02 C)   3.46 D)   1.01

SHORT ANSWER.  Write the expression or turn that best completes each assertion or answers the scrutiny.

29)  Construct a 98% belief season for the population equalize, m. Assume the population has a natural arrangement. A vague scantling of 20 train scholars has equalize annual rights of  \$3480 delay a banner intermission of  \$668. 29)  _____________

30)  Construct a 95% belief season for the population equalize, m. Assume the population has a natural arrangement. In a vague scantling of 26 computers, the equalize recover absorb was  \$160 delay a banner intermission of  \$34. 30)  _____________

31)  a) Form a 95% belief season for the population equalize, m. Assume the population has a natural arrangement. In a vague scantling of 26 computers, the equalize recover absorb was  \$174 delay a banner intermission of  \$37.

b) Suppose you did some scrutiny on recover absorbs for computers and endow that the banner intermission is  sigma = 37. Use the natural arrangement to form a 95% belief season for the population equalize, m. Compare the results. 31)  _____________

32)  A creator receives an prescribe for fluorescent easy bulbs. The prescribe requires that the bulbs keep a equalize existence brace of  850 hours. The creator excellents a vague scantling of 25 fluorescent easy bulbs and finds that they keep a equalize existence brace of  845 hours delay a banner intermission of 15 hours. Trial to see if the creator is making pleasurable easy bulbs. Use a 95% belief equalize. Assume the axioms are naturally as sorted. 32)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the assertion or answers the scrutiny.

33)  Construct a 95% belief season for the population equalize, m. Assume the population has a natural arrangement. A scantling of 20 train scholars had equalize annual rights of \$3120 delay a banner intermission of \$677. 33)  _______

A) (\$2803, \$3437) B)  (\$1324, \$1567)

C) (\$2135, \$2567) D)  (\$2657, \$2891)

34)  Construct a 90% belief season for the population equalize, m. Assume the population has a natural arrangement. A scantling of 15 vaguely separated scholars has a walk subject-matter middle of 2.86 delay a banner intermission of 0.78. 34)  _______

A) (2.51, 3.21) B)  (2.41, 3.42) C)  (2.37, 3.56) D)  (2.28, 3.66)

35)  Construct a 95% belief season for the population equalize, m. Assume the population has a natural arrangement. A scantling of 25 vaguely separated scholars has a equalize trial reckoning of 81.5 delay a banner intermission of 10.2. 35)  _______

A) (77.29, 85.71) B)  (56.12, 78.34)

C) (66.35, 69.89) D)  (87.12, 98.32)

36)  Construct a 95% belief season for the population equalize, m. Assume the population has a natural arrangement. A vague scantling of 16 fluorescent easy bulbs has a equalize existence of 645 hours delay a banner intermission of 31 hours. 36)  _______

A) (628.5, 661.5) B)  (876.2, 981.5)

C) (531.2, 612.9) D)  (321.7, 365.8)

37)  Construct a 99% belief season for the population equalize, m. Assume the population has a natural arrangement. A bunch of 19 vaguely separated scholars has a equalize age of 22.4 years delay a banner intermission of 3.8 years. 37)  _______

A) (19.9, 24.9) B)  (16.3, 26.9) C)  (17.2, 23.6) D)  (18.7, 24.1)

38)  Construct a 98% belief season for the population equalize, m. Assume the population has a natural arrangement. A consider of 14 bowlers showed that their middle reckoning was 192 delay a banner intermission of 8. 38)  _______

A) (186.3, 197.7) B)  (222.3, 256.1)

C) (328.3, 386.9) D)  (115.4, 158.8)

39)  Construct a 90% belief season for the population equalize, m. Assume the population has a natural arrangement. In a modern consider of 22 eighth walkrs, the equalize calculate of hours per week that they watched television was 19.6 delay a banner intermission of 5.8 hours. 39)  _______

A) (17.47, 21.73) B)  (18.63, 20.89)

C) (5.87, 7.98) D)  (19.62, 23.12)

40)  A vague scantling of 10 parking meters in a strand homogeneity showed the subjoined incomes for a day. Assume the incomes are naturally as sorted.

\$3.60  \$4.50  \$2.80  \$6.30  \$2.60  \$5.20  \$6.75  \$4.25  \$8.00  \$3.00

Find the 95% belief season for the gentleman equalize. 40)  _______

A) (\$3.39, \$6.01) B)  (\$2.11, \$5.34)

C) (\$4.81, \$6.31) D)  (\$1.35, \$2.85)

41)  The walk subject-matter middles for 10 vaguely separated lofty initiate scholars are listed under. Assume the walk subject-matter middles are naturally as sorted.

2.0   3.2   1.8   2.9   0.9   4.0   3.3   2.9   3.6   0.8

Find a 98% belief season for the gentleman equalize. 41)  _______

A) (1.55, 3.53) B)  (0.67, 1.81) C)  (2.12, 3.14) D)  (3.11, 4.35)

42)  A national bank needs notice regarding the checking assertion equalizes of its customers. A vague scantling of 15 assertions was checked. The equalize equalize was \$686.75 delay a banner intermission of \$256.20. Find a 98% belief season for the gentleman equalize. Assume that the assertion equalizes are naturally as sorted. 42)  _______

A) (\$513.17, \$860.33) B)  (\$238.23, \$326.41)

C) (\$326.21, \$437.90) D)  (\$487.31, \$563.80)

43)  When  475 train scholars were scrutinizeed, 125 said they own their car. Find a subject-matter venerate for p, the population symmetry of scholars who own their cars. 43)  _______

A)  0.263 B)   0.737 C)   0.357 D)   0.208

44)  A scrutinize of 100 destructive accidents showed that  11 were alcohol akin. Find a subject-matter venerate for p, the population symmetry of accidents that were alcohol akin. 44)  _______

A)  0.11 B)   0.89 C)   0.124 D)   0.099

45)  A scrutinize of  500 non-destructive accidents showed that  118 implicated the use of a cell phone. Find a subject-matter venerate for p, the population symmetry of accidents that implicated the use of a cell phone. 45)  _______

A)  0.236 B)   0.764 C)   0.309 D)   0.191

46)  A scrutinize of 250 households showed  37 owned at smallest one gun. Find a subject-matter venerate for p, the population symmetry of households that own at smallest one gun. 46)  _______

A)  0.148 B)   0.852 C)   0.174 D)   0.129

47)  A scrutinize of  2490 golfers showed that  347 of them are left-handed. Find a subject-matter venerate for p, the population symmetry of golfers that are left-handed. 47)  _______

A)  0.139 B)   0.861 C)   0.162 D)   0.122

SHORT ANSWER.  Write the expression or turn that best completes each assertion or answers the scrutiny.

48)  When  385 train scholars were scrutinizeed,  160 said they own their car. Form a 95% belief season for the symmetry of train scholars who say they own their cars. 48)  _____________

49)  A scrutinize of  600 non-destructive accidents showed that  166 implicated the use of a cell phone. Form a 99% belief season for the symmetry of destructive accidents that implicated the use of a cell phone. 49)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the assertion or answers the scrutiny.

50)  A scrutinize of 100 destructive accidents showed that 52 were alcohol akin. Form a 98% belief season for the symmetry of destructive accidents that were alcohol akin. 50)  _______

A) (0.404, 0.636) B)  (0.120, 0.340)

C) (0.560, 0.580) D)  (0.880, 0.900)

51)  A scrutinize of 250 households showed 62 owned at smallest one gun. Form a 90% belief season for the symmetry of households that own at smallest one gun. 51)  _______

A) (0.203, 0.293) B)  (0.103, 0.189)

C) (0.369, 0.451) D)  (0.683, 0.712)

52)  A scrutinize of 2450 golfers showed that 281 of them are left-handed. Form a 98% belief season for the symmetry of golfers that are left-handed. 52)  _______

A) (0.100, 0.130) B)  (0.203, 0.293)

C) (0.369, 0.451) D)  (0.683, 0.712)

SHORT ANSWER.  Write the expression or turn that best completes each assertion or answers the scrutiny.

53)  In a scrutinize of 10 golfers, 2 were endow to be left-handed. Is it serviceable to form the 90% belief season for the population symmetry, p? Explain.

53)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the assertion or answers the scrutiny.

54)  A scrutinyer at a greater hospital wishes to venerate the symmetry of the adult population of the United States that has lofty rank influence. How big a scantling is needed in prescribe to be  98% impudent that the scantling symmetry accomplish not dissent from the gentleman symmetry by over than  6%? 54)  _______

A)  378 B)   10 C)   755 D)   267

55)  A pollster wishes to venerate the symmetry of United States voters who predilection chief pain. How big a scantling is needed in prescribe to be  90% impudent that the scantling symmetry accomplish not dissent from the gentleman symmetry by over than  4%? 55)  _______

A)  423 B)   256 C)   11 D)   846

56)  A peculiar conviction poll is conducted for a politician to indicate what symmetry of the population predilections decriminalizing marijuana ownership. How big a scantling is needed in prescribe to be  95% impudent that the scantling symmetry accomplish not dissent from the gentleman symmetry by over than  3%? 56)  _______

A)  1068 B)   752 C)   2135 D)   17

57)  A creator of golf equipment wishes to venerate the calculate of left-handed golfers. How big a scantling is needed in prescribe to be  99% impudent that the scantling symmetry accomplish not dissent from the gentleman symmetry by over than  6%? A anterior consider indicates that the symmetry of left-handed golfers is  10%. 57)  _______

A)  166 B)   136 C)   185 D)   38

58)  A scrutinyer wishes to venerate the calculate of households delay two cars. How big a scantling is needed in prescribe to be  95% impudent that the scantling symmetry accomplish not dissent from the gentleman symmetry by over than  5%? A anterior consider indicates that the symmetry of households delay two cars is  24%. 58)  _______

A)  281 B)   198 C)   369 D)   4

SHORT ANSWER.  Write the expression or turn that best completes each assertion or answers the scrutiny.

59)  A aver loftyway sentry functional wishes to venerate the calculate of drivers that exceed the accelerate article traveling a real highway.

a) How big a scantling is needed in prescribe to be  90% impudent that the scantling symmetry accomplish not dissent from the gentleman symmetry by over than  2%?

b) Repeat divorce (a) grand anterior studies endow that  85% of drivers on this highway exceeded the accelerate article. 59)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the assertion or answers the scrutiny.

60)  Find the crucial treasures,  X delay (superscript (stacked) and subscript (~%3)) and X delay (superscript (stacked) and subscript (~%3)), for c = 0.95 and n = 12.    60)  _______

A) 3.816 and 21.920 B)  3.053 and 24.725

C) 4.575 and 26.757 D)  2.603 and 19.675

61)  Find the crucial treasures,  X delay (superscript (stacked) and subscript (~%3)) and X delay (superscript (stacked) and subscript (~%3)), for c = 0.90 and n = 15. 61)  _______

A) 6.571 and 23.685 B)  4.075 and 31.319

C) 4.660 and 29.131 D)  5.629 and 26.119

62)  Find the crucial treasures,  X delay (superscript (stacked) and subscript (~%3)) and X delay (superscript (stacked) and subscript (~%3)), for c = 0.98 and n = 20. 62)  _______

A) 7.633 and 36.191 B)  6.844 and 27.204

C) 8.907 and 38.582 D)  10.117 and 32.852

63)  Find the crucial treasures,  X delay (superscript (stacked) and subscript (~%3)) and X delay (superscript (stacked) and subscript (~%3)), for c = 0.99 and n = 10. 63)  _______

A) 1.735 and 23.587 B)  2.156 and 25.188

C) 2.088 and 21.666 D)  2.558 and 23.209

64)  Construct a 95% belief season for the population banner intermission s of a vague scantling of 15 men who keep a equalize impressiveness of 165.2 pounds delay a banner intermission of  12.4 pounds. Assume the population is naturally as sorted. 64)  _______

A) ( 9.1,  19.6) B)  ( 82.4,  382.4) C)  ( 2.6,  5.6) D)  ( 9.5,  18.1)

65)  Assume that the tallnesss of men are naturally as sorted. A vague scantling of 16 men keep a equalize tallness of 67.5 inches and a banner intermission of  2.6 inches. Form a 99% belief season for the population banner intermission, s. 65)  _______

A) ( 1.8,  4.7) B)  ( 1.8,  4.8) C)  ( 1.1,  2.9) D)  ( 1.8,  4.4)

66)  Assume that the tallnesss of women are naturally as sorted. A vague scantling of 20 women keep a equalize tallness of 62.5 inches and a banner intermission of  1.4 inches. Form a 98% belief season for the population discrepancy,  sigma to force of (2). 66)  _______

A) ( 1.0,  4.9) B)  ( 1.0,  2.2) C)  ( 0.7,  3.5) D)  ( 1.1,  5.1)

67)  The equalize reindeclaration term for a vague scantling of 12 microwave ovens is 8.6 years delay a banner intermission of  2.7 years. Form the 98% belief season for the population discrepancy,  sigma to force of (2). Assume the axioms are naturally as sorted 67)  _______

A) ( 3.2,  26.3) B)  ( 1.8,  5.1) C)  ( 1.2,  9.7) D)  ( 3.1,  22.5)

68)  A scholar vaguely excellents 10 CDs at a abundance. The equalize is \$8.75 delay a banner intermission of \$1.50. Form a 95% belief season for the population banner intermission, s. Assume the axioms are naturally as sorted. 68)  _______

A) (\$1.03, \$2.74) B)  (\$0.43, \$1.32)

C) (\$1.43, \$2.70) D)  (\$1.76, \$3.10)

SHORT ANSWER.  Write the expression or turn that best completes each assertion or answers the scrutiny.

69)  The tallnesss (in inches) of 20 vaguely separated adult males are listed under. Form a 99% belief season for the discrepancy,  sigma to force of (2). Assume the population is naturally as sorted.

70    72    71    70    69    73    69    68    70    71

67    71    70    74    69    68    71    71    71    72 69)  _____________

MULTIPLE CHOICE.  Choose the one choice that best completes the assertion or answers the scrutiny.

70)  The walk subject-matter middles for 10 vaguely separated scholars are listed under. Form a 90% belief season for the population banner intermission, s. Assume the axioms are naturally as sorted.

2.0    3.2    1.8    2.9    0.9    4.0    3.3    2.9    3.6    0.8 70)  _______

A) (0.81, 1.83) B)  (0.32, 0.85) C)  (0.53, 1.01) D)  (1.10, 2.01)

SHORT ANSWER.  Write the expression or turn that best completes each assertion or answers the scrutiny.

71)  A includeer of car oil is reputed to include 1000 milliliters of oil. A condition curb superintendent absences to be unfailing that the banner intermission of the oil includeers is short than 20 milliliters. He vaguely excellents 10 cans of oil delay a equalize of 997 milliliters and a banner intermission of 32 milliliters. Use these scantling results to form a 95% belief season for the gentleman treaunfailing of s. Does this belief season intimate that the change in the oil includeers is at an pleasurable equalize? 71)  _____________