A survey asked 1170 randomly selected subjects how much extra in taxes they would be willing to pay to protect the environment. The sample average was 430 with a sample standard deviation of 119. Is it appropriate to use a normal distribution to approximate a confidence interval for the population mean? If it's inappropriate, indicate why?
1) Yes.
2) No, because it was not a random sample.
3) No, because n(p-hat) < 10 or n(q-hat) < 10.
4) No, because the sample size wasn't at least 30 and the population wasn't normally distributed.
5) No, because we already know the population mean.