Suppose a student doing a telephone survey for the campus newspaper asks you, "How big a sample do I need to get accurate results?" Which of the following would be the best advice you could offer?
A) The number of cases should be at least 25 percent of the population.
B) Only samples of 3,000 or more yield truly accurate results.
C) That depends on the number of students at the college. The proportion of the population sampled is more important than the absolute size of the sample.
D) Accuracy (in terms of error reduction) improves much more for increases in sample size between 100 and 1,000 than for increases in sample size between 2,000 and 3,000.

Question

Quizplus · Accepted Answer

Accuracy improves significantly with increases in sample size from 100 to 1,000, but the rate of improvement diminishes as the sample size increases beyond that, such as from 2,000 to 3,000.

Suppose a Student Doing a Telephone Survey for the Campus