Assume a sample is used to estimate a population mean μ. Find the 99.5% confidence interval for a sample of size 53 with a mean of 70.3 and a standard deviation of 18.6.
a) (63.438, 77.162)
b) (60.291, 80.309)
c) (56.723, 83.877)
d) (52.894, 87.706)