The amount of time Americans spend watching television is closely monitored by f

Question

The amount of time Americans spend watching television is closely monitored by firms such as A.C. Nielsen because this helps to determine the advertising pricing for commercials. According to a recent survey, adult Americans spend an average of 2.33 hours per day watching television on a weekday. Assume the standard deviation for "time spent watching television on a weekday" is 1.89 hours. If a random sample of 50 adult Americans is obtained, what is the probability that the sample mean time watching television is between 2 and 3 hours? One consequence of the popularity of the Internet is that it is thought to reduce television watching. Suppose that a random sample of 40 individuals who consider themselves to be avid Internet users results in a mean time of 1.73 hours watching television on a weekday. Determine the likelihood of obtaining a sample mean of 1.73 hours or less from a population who mean is presumed to be 2.33 hours. Based on your probability obtained in pan B), do you think avid Internet users watch less television? No. 1 believe they watch TV less than 2.33 hours on average, because this is a very small probability No, I believe they watch TV less than 2.33 hours on average, because this is not a small probability Yes. I believe they watch TV less than 2.33 hours on average, because this is not a small probability Yes, I believe they watch TV less than 233 hours on average, because this is a very small probability

Explanation / Answer

A)

P( 2-2.33 / 1.89 / srqt50 < z < 3- 2.33 / 1.89 / srqt50 )

P( -1.23 < z < 2.51 ) = 1 - 0.1093 - 0.060 = 0.8307

B)

please post it in a new question

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