Posted by Olivia on .
Let’s suppose a randomly selected sample of 75 American teenagers watches an average of 1472 hours of television per year with a standard deviation of 250 hours. Construct the 95% confidence interval (CI) for the mean number of hours American teenagers watch television per year

Statistics 
MathGuru,
Formula:
CI95 = mean ± 1.96(sd/√n)
With your data:
CI95 = 1472 ± 1.96(250/√75)
Finish the calculation for your confidence interval.