When a sample size is increased, the confidence interval for the mean is then ______.
A) more significant
B) widened
C) narrowed
D) less significant

Question

Quizplus · Accepted Answer

When the sample size is increased, the standard error of the mean decreases, resulting in a narrower confidence interval. This is because with a larger sample size, there is less random variability in the data, allowing for a more precise estimate of the population mean. Therefore, the correct answer is C) narrowed.

When a Sample Size Is Increased, the Confidence Interval for the Mean