Stat 202 Quiz 4
18. Which statement is correct about the F distribution?
A. Cannot be negative
B. Cannot be positive
C. Is the same as the t distribution
D. Is the same as the z distribution
19. Analysis of variance is used to
A. compare nominal data.
B. compute t test.
C. compare population proportions.
D. simultaneously compare several population means.
20. A large department store examined a sample of the 18 credit card sales and recorded the
amounts charged for each of three types of credit cards: MasterCard, Visa and Discover. Six
MasterCard sales, seven Visa and five Discover sales were recorded. The store used an
ANOVA to test if the mean sales for each credit card were equal. What are the degrees of
freedom for the F statistic?
A. 18 in the numerator, 3 in the denominator
B. 3 in the numerator, 18 in the denominator
C. 2 in the numerator, 15 in the denominator
D. 6 in the numerator, 15 in the denominator
38. A manufacturer of automobile transmissions uses three different processes. Management
ordered a study of the production costs to see if there is a difference among the three
processes. A summary of the findings is shown below.
What are the degrees of freedom for the treatment sum of squares?
A. 2
B. 3
C. 10
D. 27
39. A manufacturer of automobile transmissions uses three different processes. Management
ordered a study of the production costs to see if there is a difference among the three
processes. A summary of the findings is shown below.
What are the degrees of freedom for the error sum of squares?
A. 3
B. 10
C. 27
D. 30
41. Given the following Analysis of Variance table for three treatments each with six
observations.
What are the degrees of freedom for the treatment and error sum of squares?
A. 3 and 18
B. 2 and 17
C. 3 and 15
D. 2 and 15
42. Given the following Analysis of Variance table for three treatments each with six
observations.
What is the critical value of F at the 5% level of significance?
A. 3.29
B. 3.68
C. 3.59
D. 3.20
43. Given the following Analysis of Variance table for three treatments each with six
observations.
What is the mean square for treatments?
A. 71.2
B. 71.4
C. 558
D. 534
44. Given the following Analysis of Variance table for three treatments each with six
observations.
What is the computed value of F?
A. 7.48
B. 7.84
C. 8.84
D. 8.48
To calculate the F statistic in ANOVA the following information is sufficient.
A. SSTotal, SST.
B. SSE, SST
C. Either A or B is enough.
D. None is sufficient