Question 1

Refer to the following partial ANOVA results from Excel (some information is missing).

Picture

The number of observations in the entire sample is

Answer

20

19

22

1 points

Question 2

Here is an Excel ANOVA table that summarizes the results of an experiment to assess the effects of ambient noise level and plant location on worker productivity. The test used a= 0.05.

Picture

Is the effect of plant location significant at a= .05?

Answer

Yes

No

Need more information to say

1 points

Question 3

Using one-factor ANOVA with 30 observations we find at a= .05 that we cannot reject the null hypothesis of equal means. We increase the sample size from 30 observations to 60 observations and obtain the same value for the sample F test statistic. Which is correct?

Answer

We might now be able to reject the null hypothesis

We surely must reject H0 for 60 observations

C.We cannot reject H0 since we obtained the same F-value

It is impossible to get the same F-value for n = 60 as for n = 30

1 points

Question 4

What are the degrees of freedom for Tukey’s test statistic for a one-factor ANOVA with with n1= 6, n2 = 6, n3 = 6?

Answer

3, 6

6, 3

6, 15

3, 15

1 points

Question 5

The Internal Revenue Service wishes to study the time required to process tax returns in three regional centers. A random sample of three tax returns is chosen from each of three centers. The time (in days) required to process each return is recorded as shown below

Picture

The test to use to compare the means would require

Answer

Three-factor ANOVA

One-factor ANOVA

Two-factor ANOVA without replication

Two-factor ANOVA with replication

1 points

Question 6

Here is an Excel ANOVA table that summarizes the results of an experiment to assess the effects of ambient noise level and plant location on worker productivity. The test used a= 0.05.

Picture

Is the effect of noise level significant at a= .01?

Answer

Yes

No

Need more information to say

1 points

Question 7

Refer to the following MegaStat output (some information is missing). The sample size was n = 65 in a one-factor ANOVA.

Picture

At a = .05, which is the critical value of the test statistic for a two-tailed test for a significant difference in means that are to be compared simultaneously? Note: this question requires a Tukey table.

Answer

2.81

2.54

2.33

1.96

1 points

Question 8

Refer to the following partial ANOVA results from Excel (some information is missing). The response variable was Y = maximum amount of water pumped from wells (gallons per minute).

Picture

The MS for interaction is

Answer

7.25

8.17

8.37

9.28

1 points

Question 9

Refer to the following partial ANOVA results from Excel (some information is missing).

ANOVA Table

Picture

The number of observations in the original sample was

Answer

59

60

58

54

1 points

Question 10

To compare the cost of three shipping methods, a random sample of four shipments is taken for each of three firms. The average cost per shipment is shown below.

Picture

In a one-factor ANOVA, degrees of freedom for the within-groups sum of squares will be

Answer

11

3

9

2

1 points

Question 11

Which is the Excel function to find the right-tail p-value for Fcalc = 4.52 with n1 = 15, n2 = 12?

Answer

=FDIST(4.52, 15, 12)

=FINV(4.52, 14, 11)

=FDIST(4.52, 14, 11)

=FINV(4.52, 15, 12)