A survey of 400 college students found that the mean number of hours students spend on

social media each day is 1.7 hours with a standard deviation of 0.5 hours.

a. Construct a 95% confidence interval for the mean number of hours students spend on social

media.

b. What is the margin of error you found in part (a). (Round final answer to three decimal

places.)

c. How many students would need to be surveyed in order to have a margin of error of 0.02?