Question

It is recommended that adults get 8 hours of sleep each night. A researcher hypothesized college students got less than the recommended number of hours of sleep each​ night, on average. The researcher randomly sampled 20 college students and calculated a sample mean of 7.5 hours per night. If the researcher wanted to perform a​ one-sample t-test, which of the following is a correct​ statement?
A: By taking a random​ sample, the researcher has guaranteed that the distribution of number of hours of sleep per night for all college students is normal.
B.The number of hours of sleep per night for all college students must be normally distributed because the sample size is small.
C.By taking a random​ sample, the researcher has guaranteed that the distribution of sample means is normal.
D.The distribution of sample means will be normal even if the distribution of the data in the population is not normal.

Answer 1

Things change, rearrange, or so do I
It ain't always for the better dawg, I can't lie
I get high cause the lows can be so cold
I might bend a little bit but I don't fold
One time for my mind and two for yours
I got food for your thoughts to sooth your soul
If you see my tears fall just let me be..
Move along, nothing to see