Question

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 95% level of confidence? How large a sample should be taken for a 99% level of confidence? Use a planning value for the population standard deviation of 6 minutes. 95% Confidence (to the nearest whole number): 99% Confidence (to the nearest whole number):

Answer 1

solution, Giren. Margin of Essor = 2 minute 6 = 6 minute ra let 1 XY 2= oos 4-!) 2/2 = Zous = 1.96 from table Margin of Emor= Zap (6 ) - 2 = 1.96 (6) 8370.0 + Sot 2 = 11.76 of 80.0 Vn VnF 5.88 square on both side na 34.57 [h=35

95 t. confidence 35 let 2=0.01 Za z = 200) = 20.005 = 2:58 from table. Margin of Error 2 = 2.58 (6) 2 = 15.48 vn un = 7.74 on both side. Square h=59.9076 [h=60 ggy confidence : 60