Select the scenarios where the methods of this section can be used to construct a confidence interval for the population mean. Assume that a is unknown.
A simple random sample of size 150 is drawn from a distribution that is not close to normal.
A nonrandom sample is drawn.
A simple random sample of size 27 is drawn from a distribution that is not close to normal.
A simple random sample of size 13 is drawn from a distribution that is approximately normal