1. Arbitron Media Research Inc. conducted a study of the iPod listening habits of men and women. One facet of the study involved the mean listening time. It was discovered that the mean listening time for men was 31 minutes per day. The standard deviation of the sample of the 10 men studied was 10 minutes per day. The mean listening time for the 11 women studied was also 31 minutes, but the standard deviation of the sample was 15 minutes. At the .10 significance level, can we conclude that there is a difference in the variation in the listening times for men and women? (Round your answer to 3 decimal places.)

The test statistic is?

2.

The following are four observations collected from each of three treatments. Test the hypothesis that the treatment means are equal. Use the .05 significance level.

Treatment 1	Treatment 2	Treatment 3
8	3	3
6	2	4
10	4	5
9	3	4

a.	State the null and the alternate hypothesis.

H0	(Click to select)The treatment means are the same.The treatment means are different.
H1	(Click to select)The treatment means are different.The treatment means are the same.

b.	What is the decision rule? (Round your answer to 2 decimal places.)

(Click to select)RejectDo not rejectH₀ if the test statistic is greater than .

c.&d.	Compute SST, SSE, and SS total and complete the ANOVA table. (Round SS, MS and F values to 2 decimal places.)

Source	SS	df	MS	F
Treatments
Error
Total

e.	State your decision regarding the null hypothesis.
	(Click to select)RejectDo not reject H0

3.

The manager of a computer software company wishes to study the number of hours senior executives by type of industry spend at their desktop computers. The manager selected a sample of five executives from each of three industries. At the .05 significance level, can she conclude there is a difference in the mean number of hours spent per week by industry?

Banking	Retail	Insurance
12	8	10
10	8	8
10	6	6
12	8	8
10	10	10

Click here for the Excel Data File

1.	Ho : 1(Click to select)=>< 2(Click to select)><= 3
	H1 :Treatment means (Click to select)areare notall the same.
2.	F.05> (Round your answer to 2 decimal places.)

Complete the ANOVA table. (Round SS, MS and F values to 2 decimal places.)

Analysis of Variance

Source	SS	df	MS	F
Treatments
Error

3.	Decision (Click to select)Do not rejectReject Ho