A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. There were 81 students in the survey.

Assuming a standard deviation of 6 hours, and a mean of 37 hours establish a 95% level confidence interval of study time for students?

35. 69 & 37

37 & 38.31

35.69 & 38.31

1.31 & 35