A random sample of 120 classrooms at a large university found that 70% of them had been cleaned
Properly. What is the standard error of the sample proportion?
A) 0.458
B) 0.082
C) 0.028
D) 0.042
E) 0.046

Question

Quizplus · Accepted Answer

The standard error of the sample proportion is calculated using the formula SE = sqrt[(p(1-p))/n], where p is the sample proportion (0.70) and n is the sample size (120). Plugging in the values, SE = sqrt[(0.70 * 0.30) / 120] = 0.042.

A Random Sample of 120 Classrooms at a Large University