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3. The amount of time Americans spend using iPhone is closely monitored by firms such as...

3. The amount of time Americans spend using iPhone is closely monitored by firms such as A.C. Nielsen because this helps to determine advertising pricing for commercials

A. Do you think the variable “weekly time spending on iPhone” would be normally distrusted? If not, what shape would you expect the variable to have?

B. According to American Time Use Survey, adult Americans spend 2.35 hours per day using iPhone on a weekday. Assume that the standard deviation for “time spending using iPhone on a weekday” is 1.93 hours. If a random sample of 40 adult Americans is obtained, describe the sampling distribution of X ̅, the mean amount of time spending iphone on a weekday.

C. Determine the probability that a random sample of 40 adult Americans results in a mean time using iPhone on a weekday of between 2 and 3 hours.

Math   Statistics-And-Probability   
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