An online survey asked 397 how much extra in taxes they would bewilling to pay to protect the environment. The sample average was$599 with a sample standard deviation of $180. Is it appropriate touse a normal distribution to approximate a confidence interval forthe population mean? If it’s inappropriate, indicate why.
Select one:
a. Yes.
b. No, because it was not a random sample.
c. No, because n(p-hat) < 10 or n(q-hat) < 10.
d. No, because the sample size wasn’t at least 30 and thepopulation wasn’t normally distributed.
e. No, because we already know the population mean.
