The Director of a Hospital Wishes to Estimate the Mean $\bar { x } = 17.2$

Multiple Choice

The director of a hospital wishes to estimate the mean number of people who are admitted to the emergency room during a 24-hour period. The director randomly selects 49 different 24-hour periods and determines the number of admissions for each. For this sample, $\bar { x } = 17.2$ and $s ^ { 2 } = 25$ . Estimate the mean number of admissions per 24 -hour period with a $90 \%$ confidence interval.

A) $17.2 \pm .643$
B) $17.2 \pm .168$
C) $17.2 \pm 5.875$
D) $17.2 \pm 1.175$