3. (4pts) Suppose that the number of hours of television watched by the American population has a mean of 2hrs and a sta

[answerhappygod]

3 4pts Suppose That The Number Of Hours Of Television Watched By The American Population Has A Mean Of 2hrs And A Sta 1 (89.4 KiB) Viewed 32 times

3. (4pts) Suppose that the number of hours of television watched by the American population has a mean of 2hrs and a standard deviation of 1.3 hrs. (a) What sample size n is needed to guarantee at least a standard deviation of 0.20? (b) Is this n sufficient to approximate the distribution of X as a normal? If no, what sample size would allow for an approximation? 1 (c) Using the n from (a) if sufficient, if not use the n proposed in (b), what is the approximate probability that the average hours watched by n Americans falls between 6.5 and 7.9 hours?