21. Consider a daily TV programme like the 10 o'clock news that over the last calendar year had a mean daily audience of 4.0 million viewers. For a sample of 40 days during the current year, the daily audience was 4.15 million viewers with a sample standard deviation of 0.45 million viewers. a. If the TV management company would like to test for a change in mean viewing audience, what statistical hypotheses should be set up? b. What is the pvalue? c. Select your own level of significance. What is your conclusion