According to National Sleep Foundation, average number of hours
of sleep recommended for adults over 18 years, is 8 hours per
night. A sample of 100 students was randomly selected, and the
number of hours each student slept last night was recorded. Use the
given sample to build the 90% confidence interval for the
population mean number of hours of sleep for all college students.
a. What is the sample statistic (name and notation)? b. What
population parameter are we estimating with this sample statistic
(name and notation)? c. Use your data file and StatKey to find the
sample mean and standard deviation. Calculate the Standard Error.
d. Find and write the 90% confidence interval using appropriate
formula.