Random and independent samples of50

recent prime time airings from each of two major networks have been considered. The first network aired a mean of108.9

commercials during prime time, with a standard deviation of5.3

commercials. The second network aired a mean of111.1

commercials, with a standard deviation of5.6

commercials. As the sample sizes are quite large, the population standard deviations can be estimated using the sample standard deviations. Construct a95

%

confidence interval for

1

2

, the difference between the mean number of commercials

1

aired during prime time by the first network and the mean number of commercials

2

aired during prime time by the second network. Then find the lower limit and upper limit of the95

%

confidence interval.

Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places. (If necessary, consult alist of formulas.)