14-12-2022
Mathematics

Answered

A marketing firm wants to know the average amount of time young adults (18 to 25-year-
olds) spend watching Netflix each day. A survey is completed by 75 young adults and the mean time
spent watching Netflix is found to be 162.5 minutes with a standard deviation of 40 minutes.

a. Construct a 95% confidence interval for the mean amount of time that young adults spend
watching Netflix each day. (Round your answer to 3 decimal places)

b. Explain in words what this confidence interval means.

c. How many young adults would need to be surveyed to have a margin of error of 2?

Answer :

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