Discuss the below:
Q: A class survey in a large class for first year college students asked, "About how many minutes do you study on a typical weeknight?" The mean response of the 269 students was x (bar over the x) = 137 minutes. Suppose that we know that the study time follows a normal distribution with standard deviation = 65 minutes in the population of all first year students at this university.
A) Use the survey result to give a 99% confidence interval for the mean study time of all first year students.
B) What condition that is not yet mentioned must be met for the confidence interval to be valid?