can you show me how to solve this?

Question

im not asking for you to do my homework. im asking for you to show me how to do this so that i can do it on my homework.

here is the poblem:

A fast food outlet claims that the mean waiting time in line is less than 3.9 minutes. A random sample of 60 customers has a mean of 3.8 minutes with a standard deviation of 0.6 minute. If alpha = 0.05, test the fast food outlet's claim using P-values.

Answer 1

assume the hypothesis " waiting times are normally distributed with a mean is 3.9"

think whether you are going to assume an sd of 0.6 or sqrt(n/(n-1))0.6,

what is the probability of observing an actual average of 3.8? is it past the 5% low value tail point?