In: Statistics and Probability
The 2015 American Time Use Survey contains data on how many minutes of sleep per night an average college student gets. According to this survey, the minutes that college students sleep per night are right skewed with a mean of 529.9 minutes and standard deviation 135.6 minutes.
Suppose we take a random sample of size 20. What is the probability that the mean of the 20 times is greater than 538 minutes?
Answer --> It is not appropriate to calculate probabilities in this situation. (explain why, please)
Suppose we take a random sample of size 60. What is the probability
that the mean of the 60 times is less than 479.4 minutes?
A. 0.0020
B. 0.9980
C. 0.3557
D. 0.6643
E. It is not appropriate to calculate probabilities in this situation.