Nielsen Media Research conducted a study of household television viewing times during the 8 p.m. to 11 p.m. time period. The data contained in the file named Nielsen are consistent with the findings reported (The World Almanac, 2003). Based upon past studies the population standard deviation is assumed known with σ = 3.5 hours. Develop a 95% confidence interval estimate of the mean television viewing time per week during the 8 p.m. to 11 p.m. time period.