1. Nintendo Sony would like to test the hypothesis that a difference exists

1. Nintendo Sony would like to test the hypothesis that a difference exists in the average age of users of a Wii, a PlayStation, or an Xbox console game. The following data represent the age of a random sample of Wii, PlayStation, and Xbox users.

Wii	PlayStation	Xbox
37	26	31
31	21	20
47	24	38
29	24	31
36	25	30

2. The grand mean for these observations is ________.

[removed]		30.0
[removed]		30.9
[removed]		31.3
[removed]		31.8

3. The critical value for a two-tailed test of H0: ß1 = 0 at a (alpha) = .05 in a simple regression with 22 observations is:

[removed]		+ or - 1.725
[removed]		+ or - 2.086
[removed]		+ or - 2.528
[removed]		+ or - 1.960

4. Amelia used a random sample of 100 accounts receivable to estimate the relationship between Days (number of days from billing to receipt of payment) and Size (size of balance due in dollars). Her estimated regression equation was Days = 22 + 0.0047 Size with a correlation coefficient of .300. From this information we can conclude that:

[removed]		9 percent of the variation in Days is explained by Size
[removed]		autocorrelation is likely to be a problem
[removed]		the relationship between Days and Size is significant
[removed]		larger accounts usually take less time to pay

5. The sum of squares ________ measures the variation between each data value and the corresponding sample mean.

[removed]		within
[removed]		between
[removed]		interaction
[removed]		error

6. Examine the following two-factor analysis of variance table:

two factor

Does the ANOVA table indicate that the levels of factor B have equal means? Use a significance level of 0.05.

[removed]		Fail to reject H0. Conclude that there is not sufficient evidence to indicate that at least two levels of Factor B have different mean responses.
[removed]		Reject H0. Conclude that there is sufficient evidence to indicate that at least two levels of Factor B have different mean responses.
[removed]		Fail to reject H0. Conclude that there is sufficient evidence to indicate that at least two levels of Factor B have different mean responses.
[removed]		Reject H0. Conclude that there is not sufficient evidence to indicate that at least two levels of Factor B have different mean responses.

7. The following regression output is from a multiple regression model:

Regression
The variables t, t2, and t3 represent the t, t-squared, and t-cubed respectively where t is the indicator of time from periods t = 1 to t = 20. Which of the following best describes the type of forecasting model that has been developed?

[removed]		A complete third-order polynomial model
[removed]		A tri-variate smoothed regression model
[removed]		A nonlinear trend model
[removed]		A qualitative regression model

8. The following regression output was generated based on a sample of utility customers. The dependent variable was the dollar amount of the monthly bill and the independent variable was the size of the house in square feet.

Regression
Based on this regression output, what is the 95 percent confidence interval estimate for the population regression slope coefficient?

[removed]		Approximately -0.0003 ----- +0.0103
[removed]		About -0.0082 ----- +0.0188
[removed]		Approximately -32.76 ----- +32.79
[removed]		None of the above

9. Consider this partially completed one-way ANOVA table:

ANOVA
Based on the analysis of variance F-test, what conclusion should be reached regarding the null hypothesis? Test using alpha = 0.05.

[removed]		Since 11.1309 > 2.9467 accept H0 and conclude that all population means are the same.
[removed]		Since 2.9467 > 11.1309 accept H0 and conclude that all population means are the same.
[removed]		Since 11.1309 > 2.9467 reject H0 and conclude that at least two populations means are different.
[removed]		Since 2.9467 > 11.1309 reject H0 and conclude that at least two populations means are different.

10. Consider this partially completed one-way ANOVA table:

ANOVA
Fill in the ANOVA table with the missing values.

[removed]		Between Samples df = 6, MSB = 290.833, F-ratio = 14.667, SSW = 4,759, MSW = 19.829
[removed]		Between Samples df = 6, MSB = 290.833, F-ratio = 7.948, SSW = 4,759, MSW = 19.829
[removed]		Between Samples df = 5, MSB = 290.833, F-ratio = 14.667, SSW = 4,759, MSW = 19.829
[removed]		Between Samples df = 5, MSB = 290.833, F-ratio = 7.948, SSW = 4,759, MSW = 19.829

11. Randomized block ANOVA partitions the total sum of squares into the sum of squares

[removed]		between, within, and error.
[removed]		between, within, and block.
[removed]		between, block, and error.
[removed]		between and within.

12. Consider the following partially completed computer printout for a regression analysis where the dependent variable is the price of a personal computer and the independent variable is the size of the hard drive.

Regression
Based on the information provided, what is the F statistic?

[removed]		About 8 .33
[removed]		Just over 2.35
[removed]		About 4.76
[removed]		About 69.5

13. The variation attributable to factors other than the relationship between the independent variables and the explained variable in a regression analysis is represented by

[removed]		regression sum of squares.
[removed]		error sum of squares.
[removed]		total sum of squares.
[removed]		regression mean squares.

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

The F statistic is:

[removed]		2.88
[removed]		4.87
[removed]		5.93
[removed]		6.91

15. Examine the following two-factor analysis of variance table:

two factor
Determine if the levels of factor A have equal means. Use a significance level of 0.05.

[removed]		Fail to reject H0. Conclude that there is sufficient evidence to indicate that at least two levels of Factor A have different mean responses.
[removed]		Fail to reject H0. Conclude that there is not sufficient evidence to indicate that at least two levels of Factor A have different mean responses.
[removed]		Reject H0. Conclude that there is sufficient evidence to indicate that at least two levels of Factor A have different mean responses.
[removed]		Reject H0. Conclude that there is not sufficient evidence to indicate that at least two levels of Factor A have different mean responses.

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

Degrees of freedom for between groups variation are:

[removed]		3
[removed]		4
[removed]		5
[removed]		Can't tell from given information

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1. Nintendo Sony would like to test the hypothesis that a difference exists

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