What effect will an outlier have on a confidence interval that is based on a small sample size?
A) The confidence interval will be wider than an interval without the outlier.
B) The interval will be smaller than an interval without the outlier.
C) The interval will be the same with or without the outlier.
D) The interval will reveal exclusionary data.

Question

Quizplus · Accepted Answer

Outliers in a small sample size can significantly affect the mean and standard deviation, leading to a wider confidence interval as it tries to account for the increased variability introduced by the outlier.

What Effect Will an Outlier Have on a Confidence Interval