The sponsors of television shows targeted at the market of 5- to 8-year olds want to test the hypothesis that children watch television at most 20 hours per week. The population of viewing hours per week is known to be normally distributed. A market research firm conducted a study of children in this age group and found the summary statistics here for their weekly hours of television viewing. Conduct an appropriate hypothesis test. Find the t-statistic and the appropriate conclusion at the 0.01 level of significance.