Find a 99% interval for the previous problem. (54.20, 65.80) (50.40, 69.60) (51.36, 68.64) (54.48, 65.52)

Question 7: find a 99% interval for the previous problem ..


Extracted text: Find a 99% interval for the previous problem. (54.20, 65.80) (50.40, 69.60) (51.36, 68.64) (54.48, 65.52)


Extracted text: A university wants to determine the population average grade of all students who take a statistics class online. The grade distribution of online statistics classes is normal. The average grade of 20 online statistics classes is 60% with a standard deviation of 15%. Find a 95% confidence interval for the average grade of all online statistics classes. (52.98, 67.02) (53.43, 66.57) (59.79, 60.21) The sample size is too small to compute a confidence interval.