# Construct a 95% confidence interval for the population mean, m.

Construct a 95% confidence interval for the population mean, m. Assume the population has a normal distribution. A random sample of 16 fluorescent light bulbs has a mean life of 645 hours with a standard deviation of 31 hours.

**Solution: **The 95% confidence interval is given by:

_{}

_{}

**GO TO NEXT PROBLEM >>**