20ptsA researcher wants to study the students study habit an

20pts)A researcher wants to study the students study habit, and one of her goal is find out how much time college students will take to study outside of class during a week. She collected a SRS of 10 students, and their study time (in hours) for a week is listed: 10.4 18.8 5.9 24.7 12.8 15.3 16.7 2.8 20.5 3.1

(1) (10pts)If from her previous research experience, the population standard deviation of students study time outside of class for a week is 10.8 hours, what can she conclude about the average study time for all college students(95% confidence interval)?

(2) (10pts)If she has no information about the population standard deviation for the study time of college students, what can she conclude about the average study time for all college students(95% confidence interval)?

Solution