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# Stat 200 Week 8 Homework questions

• From Mathematics, Statistics
• Due on 08 Jul, 2015 10:00:00
• Asked On 03 Jul, 2015 09:20:56
• Due date has already passed, but you can still post solutions.
Question posted by

There are 8 questions.  Required full solutions showing work/formulas and any tables/calulators/excell formulas that are used to solve the problem.

LANE

Chp 15 10) 573

1. 10. If an experiment is conducted with 5 conditions and 6 subjects in each condition, what are dfn and dfe?

17) 574

2. 17. The following data are from a hypothetical study on the effects of age and time on scores on a test of reading comprehension. Compute the analysis of variance summary table.

30 minutes    12 year olds      16 year olds

66                    74

68                    71

59                     67

72                     82

46                     76

60 Minutes       69                      95

61                      92

69                      95

73                      98

61                      94

ILLOWSKY

Chp 13 61) 716

Use the following information to answer the next three exercises. Suppose a group is interested in determining whether teenagers obtain their drivers licenses at approximately the same average age across the country. Suppose that the following data are randomly collected from five teenagers in each region of the country. The numbers represent the age at which teenagers obtained their drivers licenses.

Northeast         South          West       Central        East

16.3                 16.9             16.4         16.2            17.1

16.1                 16.5              16.5        16.6            17.2

16.4                 16.4              16.6         16.5            16.6

16.5                 16.2              16.1         16.4            16.8

x¯ =

s 2

H0: µ1 = µ2 = µ3 = µ4 = µ5

Hα: At least any two of the group means µ1, µ2, …, µ5 are not equal.

3. 61. degrees of freedom – numerator: df(num) = _________ (show work)

63) 716

4. 63. F statistic = ________ (show work

69) 717

5. 69. A researcher wants to know if the mean times (in minutes) that people watch their favorite news station are the same. Suppose that Table 13.24 shows the results of a study.

CNN       FOX     LOCAL

45          15          72

12          43          37

18         68           56

38         50           60

23         31           51

35         22

Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of 0.05.

71) 718

6. 71. Are the mean number of times a month a person eats out the same for whites, blacks, Hispanics and Asians? Suppose that Table 13.26 shows the results of a study.

White     Black     Hispanic     Asian

6            4            7                 8

8            1            3                 3

2            5            5                 5

4            2            4                 1

6                         6                  7

Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of 0.05.

77) 721

7. 77. A grassroots group opposed to a proposed increase in the gas tax claimed that the increase would hurt working-class people the most, since they commute the farthest to work. Suppose that the group randomly surveyed 24 individuals and asked them their daily one-way commuting mileage. The results are as follows.

Working Class          Professional (Middle Class)          Professional (Wealthy)

17.8                          16.5                                               8.5

26.7                          17.4                                               6.3

49.4                           22.0                                              4.6

9.4                             7.4                                               12.6

65.4                           9.4                                               11.0

47.1                           2.1                                               28.6

19.5                           6.4                                               15.4

51.2                           13.9                                              9.3

Determine whether or not the variance in mileage driven is statistically the same among the working class and professional (middle income) groups. Use a 5% significance level.

81) 722

8. 81. Is the variance for the amount of money, in dollars, that shoppers spend on Saturdays at the mall the same as the variance for the amount of money that shoppers spend on Sundays at the mall? Suppose that the Table 13.34 shows the results of a study

Saturday  Sunday  Saturday  Sunday

75             44           62            137

18            58            0               82

150          61           124             29

94            19           50              127

62            99           31              141

73            60           118              73

89

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## [Solved] Stat 200 Week 8 Homework questions

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Lane Chap. 15 10. If an experiment is conducted with 5 conditions and 6 subjects in each condition, what are dfn and ...
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