Suppose I want to estimate the mean household income of a neighborhood within a city. It is expected that the population doesn't follow a normal distribution. I get a sample of 25 households and ask them of their household income. The mean household income for this sample of 25 households in US dollars was 56,000. The sample standard deviation was calculated to be 15,000. The distribution to be used for interval estimate on mean household income is:
a) It cannot be estimated
b) Exponential
c) t
d) I don't need to do an interval estimate, I know the mean already
e) Poisson
f) Normal
g) Binomial
h) one of the other answers listed here are correct
i) Z