A random sample of 150 people was taken from a very large population. Ninety of the people in the sample were females. The standard error of the proportion of females is
A)0.0016
B)0.2400
C)0.1600
D)0.0400

Question

Quizplus · Accepted Answer

The standard error of the proportion is calculated using the formula SE = sqrt[p(1-p)/n], where p is the sample proportion (90/150 = 0.6) and n is the sample size (150). SE = sqrt[0.6(0.4)/150] = 0.0400.

A Random Sample of 150 People Was Taken from a Very