Confidence interval for the difference of population h Espano Random and independent samples of 70 recent prime time airings from each of two major networks have been considered. The first network aired a mean of 109.2 commercials during prime time, with a standard deviation of 5.8 commercials. The second network aired a mean of 110.8 commercials, with a standard deviation of 5.7 commercials. As the sample sizes are quite large, the population standard deviations can be estimated using the sample standard deviations. Construct a 90% confidence interval for , -H, the difference between the mean number of commercials u, aired during prime time by the first network and the mean number of commercials , aired during prime time by the second network, Then find the lower limit and upper limit of the 90% confidence interval. D Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places. (If necessary, consult a list of formulas.) Lower limit: X 5 ? Upper limit