Confidence intervals may be very narrow when:
A)the sample size is large and variability is low
B)the sample size is small and the variability is low
C)the sample size is large and the variability is high
D)the sample size is small and the variability is high
E)the sample size is average and the variability is higher than average

Question

Quizplus · Accepted Answer

Confidence intervals become narrower when there is a larger sample size, as there is more data to base the estimation on. Additionally, lower variability within the sample also leads to narrower confidence intervals, as the data points are more clustered together and there is less spread.

Confidence Intervals May Be Very Narrow When