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


12yearolds 
16yearolds 

30 minutes 

66 

74 



68 

71 



59 

67 



72 

82 




46 

76 

60 minutes 

69 

95 



61 

92 



69 

95 



73 

98 




61 

94 

Illowsky – Ch. 13
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 

xbar = 
________ 
________ 
________ 
________ 
________ 

s^2 = 
________ 
________ 
________ 
________ 
________ 

H0:µ1=µ2=µ3=µ4=µ5 

Hα: At least any two of the group meansµ1,µ2, …,µ5are not equal. 

61. degrees of freedom – numerator: df(num) = ________
63. F static = ________
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. 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 
77. A grassroots group opposed to a proposed increase in the gas tax claimed that the increase would hurt workingclass people the most, since they commute the farthest to work. Suppose that the group randomly surveyed 24 individuals and asked them their daily oneway commuting mileage. The results are as follows.
WorkingClass 

Professional (middles incomes) 



Professional (wealthy) 



17.8 


16.5 


8.5 


26.7 


17.4 


6.3 


49.4 


22 


4.6 


9.4 


7.4 


12.6 


65.4 


9.4 


11 


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. 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 
39 
94 
19 
50 
127 
62 
99 
31 
141 
73 
60 
118 
73 

89 


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The best test for the above data is One Way Analysis of variance (ANOVA). An independent Group ANOVA is an extension of the independen...