For Exercises assume that all variables are normally distributed, that the samples are independent, that the population variances are equal, and that the samples are simple random samples, one from each of the populations. Also, for each exercise, perform the following steps.

a. State the hypotheses and identify the claim.
b. Find the critical value.
c. Compute the test value.
d. Make the decision.
e. Summarize the results, and explain where the differences in the means are.
Use the traditional method of hypothesis testing unless otherwise specified.

The average U.S. television viewing time (2010–2011) for all viewers is 34 hours and 16 minutes per week. Random samples of three different groups indicated their weekly viewing habits (in hours) as listed below. At the 0.05 level of significance, is there evidence of a difference in means between the groups?

Men 21+ years Women 21+ years "Teens" 12-20 years 28 44 26 37 20 25 31 32 31 47 40 34 40 31 28 34