Question

Use the given degree of confidence and sample data to construct a confidence interval for the population mean µ. Assume
that the population has a normal distribution.
n = 10, x = 12.3, s = 3.9, 95% confidence

9.55 < µ < 15.05
9.52 < µ < 15.08
9.51 < µ < 15.09
10.04 < µ < 14.56