A researcher surveys middle-school students on their study habits. She finds that in a random sample of 28 middle-school students, the mean amount of time they spend working on the computer each night is 2.4 hours with a standard deviation of 0.92 hours. Use the sample to construct a 99% confidence interval for the mean amount of time that all middle-school students spend working on the computer each night:
A) Construct a 99% confidence interval.
B) Calculate the margin of error.
C) Interpret the confidence interval.
D) All of the above.
