The mean amount of time a random sample of 47Americans 16 and older spent watching television each day is 3.1 hours and it is known the population standard deviationis 0.55 hour. Construct a 90%...

The mean amount of time a random sample of 47Americans 16 and older spent watching television each day is 3.1 hours and it is known the population standard deviationis 0.55 hour. Construct a 90% confidence interval for the population mean amount of time Americans 16 or older watch television. Interpret your result.

b) If in the above scenario, a claim is made that the population mean number of hours Americans age 16and older watch television is 3.5hours per day. Would this claim be valid or invalid, based on the results in part (a)?