A Statistics Professor Has 115 Students in a Statistics Class

Multiple Choice

A statistics professor has 115 students in a statistics class and would like to estimate the number of hours each student studied for the last exam. A random sample of 24 students was found to study an average of 6.8 hours with a standard deviation of 2.2 hours. The 90% confidence interval to estimate the average number of hours studying for the exam is ________.

A) (5.79, 7.81)
B) (5.86, 8.74)
C) (6.69, 6.91)
D) (6.11, 7.49)