Random and independent samples of recent prime time airings from each of two major networks have been considered. The first network aired a mean of
commercials during prime time, with a standard deviation of
commercials. The second network aired a mean of
commercials, with a standard deviation of
commercials. As the sample sizes are quite large, the population standard deviations can be estimated using the sample standard deviations. Construct a
confidence interval for
, the difference between the mean number of commercials
aired during prime time by the first network and the mean number of commercials
aired during prime time by the second network. Then complete the table below.
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