Intermediate computations | Mathematics homework help

Random and independent samples ofÿÿrecent prime time airings from each of two major networks have been considered. The first network aired a mean ofÿÿcommercials during prime time, with a standard deviation ofÿÿcommercials. The second network aired a mean ofÿÿcommercials, with a standard deviation ofÿÿcommercials. As the sample sizes are quite large, the population standard deviations can be estimated using the sample standard deviations. Construct aÿÿconfidence interval forÿ, the difference between the mean number of commercialsÿÿaired during prime time by the first network and the mean number of commercialsÿÿaired during prime time by the second network. Then complete the table below.
Carry your intermediate computations to at least three decimal places. Round your answers to at least two decimal places. (If necessary, consult aÿlist of formulas.)
ÿ
What is the lower limit of the 99% confidence interval?
What is the upper limit of the 99% confidence interval?