The McClatchy News Service (San Luis Obispo Telegram-Tribune, June 13, 1991) reported on a study of violence on television during primetime hours. The following table summarizes the information reported for four networks:

Suppose that each of these sample means was computed on the basis of viewing n = 50 randomly selected primetime hours and that the population standard deviation for each of the four networks is known to be σ = 5.

a. Compute a 95% confidence interval for the true mean number of violent acts per prime-time hour for ABC.

b. Compute 95% confidence intervals for the mean number of violent acts per prime-time hour for each of the other three networks.

c. The National Coalition on Television Violence claims that shows on ABC are more violent than those on the other networks. Based on the confidence intervals from Parts (a) and (b), do you agree with this conclusion? Explain.

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Network ABC CBS FOX NBC Mean Number of Violent Acts per Hour 15.6 11.9 11.7 11.0