A professor at a university wants to estimate the average number of hours of sleep students get during exam week. On the first day of exams, she asked 20 students
how many hours they had slept the night before. The average of the sample was 5.88
with a standard deviation of 1.942. When estimating the average amount of sleep
with a 95% confidence interval, what is the margin of error?
1) 0.9089
2) 0.4342
3) 0.9058
4) 0.7509
5) 0.4508