ll a} The Advance cable network claims that the average customer watches 48 hours or less of a sport channel per month. They collect data on 48 individuals' sport channel viewing habits and find that the mean number of hours that the 48 customers spent watching the sport channel was 49.6 hours. If the standard deviation of all Advance's customers is nine hours, can we conclude at the 1% significance level that they are right? b) The Advance cable network also hired a researcher to determine customers' sport channel viewing habits between Toronto and Windsor. They took a random sample of 7 customers in Toronto and 5 customers in Windsor and asked each of them to report the number of hours watching the sport channel over a set period of time. The results are shown in the table below. Estimate with 1% significance level the differences in the average hours of watching the sport channel between Toronto and Windsor. Sample Standard Deviation Average