Quiz
Quiz Review

1. What distribution does the F distribution approach as the sample size increases?
A: Binomial
B: Normal
C: Poisson
D: Exponential
2. 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 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
3. In ANOVA, an F statistic is used to test a null hypothesis such as:
A: Ho: s21 = s22= s23
B: Ho: s21 s22 s23
C: Ho: m1 = m2= m3
D: Ho: m1 m2 m2
4. If an ANOVA test is conducted and the null hypothesis is rejected, what does this indicate?
A: Too many degrees of freedom
B: No difference between the population means
C: A difference between at least one pair of population means
D: None of the above
5. A preliminary study of hourly wages paid to unskilled employees in three metropolitan areas was conducted.  Seven employees were included from Area A, 9 from Area B and 12 from Area C.  The test statistic was computed to be 4.91. What can we conclude at the 0.05 level?
A: Mean hourly wages of unskilled employees all areas are equal
B: Mean hourly wages in at least 2 metropolitan areas are different
C: More degrees of freedom are needed
D: None of these is correct
6. A manufacturer of automobile transmissions uses three different processes.  The 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 is the sum of squares for the treatment?

A: 67.80
B: 58.07
C: 149.34
D: 23.47
7. A manufacturer of automobile transmissions uses three different processes.  The 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 is the sum of squares of the error?

A: 67.80
B: 58.07
C: 149.34
D: 23.47
8. A manufacturer of automobile transmissions uses three different processes.  The 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 is the critical value of F at the 5% level of significance?

A: 19.45
B: 3.00
C: 3.35
D: 3.39
9. A manufacturer of automobile transmissions uses three different processes.  The 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 is the critical value of F at the 1% level of significance?

A: 99.46
B: 5.49
C: 5.39
D: 4.61
10. A manufacturer of automobile transmissions uses three different processes.  The 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
11. A manufacturer of automobile transmissions uses three different processes.  The 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
12. A manufacturer of automobile transmissions uses three different processes.  The 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 total degrees of freedom?

A: 27
B: 28
C: 29
D: 30
13. A manufacturer of automobile transmissions uses three different processes.  The 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 is the mean square for treatments?

A: 2.511
B: 2.151
C: 33.9
D: 29.035
14. A manufacturer of automobile transmissions uses three different processes.  The 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 is the mean square for error?

A: 2.511
B: 2.151
C: 33.9
D: 29.035
15. A manufacturer of automobile transmissions uses three different processes.  The 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 is the calculated F?

A: 0.086
B: 1.168
C: 11.56
D: 13.50


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