The Red Cross Wanted to Know Whether an Ad Campaign

Multiple Choice

The Red Cross wanted to know whether an ad campaign designed to persuade people to donate blood actually increased blood donations.For a sample of N = 4 blood donation centers,the mean increase in blood donations was 10 pints,with a standard deviation of 2 pints.If the Red Cross could collect data from the entire population of blood donation centers,what would one expect the population standard deviation to be?

A) 2
B) 2.31
C) 2.67
D) 20