Suppose that over the last 20 weeks, a law firm had a total of 1045 consultation calls, and that 126 of them did not get an appointment for an initial consult within 24 hours.The lower and upper control limits on the appropriate control chart for these data are ________________________ .
A)0.091 and 0.151
B)0 and 0.124
C)0 and 0.342
D)0.184 and 0.262
E)0.366 and 0.458

Question

Quizplus · Accepted Answer

To calculate the control limits for a proportion, we use the formula p ± 3√(p(1-p)/n), where p is the proportion of calls not getting an appointment within 24 hours, and n is the total number of calls. Here, p = 126/1045 ≈ 0.121, and n = 1045. Plugging these values into the formula gives us the lower and upper control limits of approximately 0.091 and 0.151, respectively.

Suppose That Over the Last 20 Weeks, a Law Firm