8. the gallup poll has decided to increase th...
8. the gallup poll has decided to increase the size of its random sample of voters from about 1500 people to about 5000 people right before an election. the poll is designed to estimate the proportion of voters who favor a new law banning smoking in public places. the effect of this increase is to: a reduce the bias of the estimate b increase the bias of the estimate c increase the variability of the estimate d reduce the variability of the estimate
Answer
# Brief Explanations:
The bias of a sample depends on the sampling method, not the sample size. Larger sample sizes generally lead to more precise estimates. Variability is inversely related to sample size. As the sample size increases from 1500 to 5000, the standard error (a measure of variability) decreases, reducing the variability of the estimate.
# Answer:
D. reduce the variability of the estimate