Use the Given Degree of Confidence and Sample Data to Construct

Multiple Choice

Use the given degree of confidence and sample data to construct a confidence interval for the population mean $\mu$ Assume that the population has a normal distribution. n=30 , $\bar { x } = 84.6$ s=10.5,90 % confidence

A) $79.32 < \mu < 89.88$
B) $81.36 < \mu < 87.84$
C) $81.34 < \mu < 87.86$
D) $80.68 < \mu < 88.52$