According to a Hospital Administrator,historical Records Over the Past 10 $\hat { p }$

Multiple Choice

According to a hospital administrator,historical records over the past 10 years have shown that 20 percent of the major surgery patients are dissatisfied with after-surgery care in the hospital.A scientific poll based on 400 hospital patients has just been conducted.Sixty-four patients indicated that they were dissatisfied with the after-surgery care.What are the mean and the standard deviation of the sampling distribution of $\hat { p }$ ?

A) 16% and .034%
B) 20% and 1.83%
C) 20% and 2%
D) 20% and .034%
E) 20% and 16%