The narrower the confidence interval,the more precise it is.With this in mind,which combination of factors will produce the most precise estimate of the difference between two population means?
A)Two samples of n = 20 and 80% confidence
B)Two samples of n = 20 and 90% confidence
C)Two samples of n = 50 and 80% confidence
D)Two samples of n = 50 and 90% confidence

Question

Quizplus · Accepted Answer

Larger sample sizes and lower confidence levels both contribute to narrower (more precise) confidence intervals. Option C has the largest sample size (n = 50) and the lower confidence level (80%), making it the most precise estimate.

The Narrower the Confidence Interval,the More Precise It Is