In a Random Sample of Patient Records in Cutter Memorial

Multiple Choice

In a random sample of patient records in Cutter Memorial Hospital, six-month postoperative exams were given in 90 out of 200 cases, while in Paymor Hospital such exams were given in 110 out of 200 cases. The pooled proportion is:

A) .50
B) .40
C) .30
D) .20