Question

most universities recommend spending 3 hours of outside studying for every 1 hour in lecture. For courses with 3 hours of class a week there should be 9 hours of studying outside of class each week. You ask the 25 students in your recitation how many hours a week they spend studying outside of lecture/recitation. The sample average is 7 hours and a standard deviation of 4 hours. d. The parameter of interest is: the population mean (x the sample mean fircle one) b. The point estimate is the population meart/ the sample mean (circle one) c. Calculate the margin of error (for 95% confidence): altes) 71.6 d. Fill in the blanks: The 95% confidence interval for is 7#2(1/25) 7+ 1.6 7-1.6 e. What is the sample in this situation? The sample is the hours spant f. What would be an appropriate population to draw inference to? g. If we wanted to interpret this confidence interval we would say: With_13_% confidence we think that the average time spent studying per week for a 3 credit hour class for the population is between and hours per week. h. Is it plausible that the population average is the recommended 9 hours per week (with 95% confidence)? Explain. i. Is it plausible that the population average is only 6 hours per week (with 95% confidence)? Explain. j. Your friend is in another recitation with 25 students and the 95% confidence interval was (5.2,7.8). 1. What the sample average of your friend's recitation? ii. What was the margin of error used in that confidence interval? iii. Which recitation had more variability in the study hours (a larger standard deviation)?