Question

QUESTION 7

1. In developing patient appointment schedules, a medical center wants to estimate the mean time that a staff member spends with each patient. How large a sample should be taken if the desired margin of error is two minutes at a 99% level of confidence? Use a planning value for the population standard deviation of 8 minutes.

   		100
   		102
   		104
   		106

Answer 1

Population standard deviation, $\small \sigma$ = 8

Margin of error, E = 2

At $\small \alpha$ = 1-0.99 = 0.01, critical value,
_a/2
= ABS(NORM.S.INV(0.01/2)) = 2.576

Sample size =

rl 30 2.576 8 2 106.17 106