An experiment on the effect of vitamin A on cancer uses two randomly chosen groups of 200 men each, one given vitamin A and the other a placebo. An estimate from a similar experiment using two groups of 1000 men each would have
A) less bias.
B) more bias.
C) more variability.
D) less variability.

Question

Quizplus · Accepted Answer

Larger sample sizes reduce variability in the estimates of the effects being studied, making the results more reliable and precise.

An Experiment on the Effect of Vitamin a on Cancer