An educator is interested in the mean time high school students spend on Facebook. She obtains a simple random sample of 24 high school students and finds that the mean time spent on Facebook was 100 minutes per day with a standard deviation of 32 minutes. Find a 95% confidence interval for the true mean time high school students spend on Facebook per day.

Select one:

a.

( 81.663, 118.337)

b.

( 18.687, 29.313)

c.

( 88.805, 111.195 )

d.

( 86.488, 113.512 )