Question

Describe how an outlier would affect a confidence interval?A)Outliers do not affect a confidence interval.B)Outliers decrease the width of the confidence intervalC)Outliers increase the width of the confidence intervalD)Outliers double the width of the confidence interval

Answer 1

Since an outlier increases the standard deviation of a data set. We conclude that an outlier increases the width of the confidence interval. Therefore the answer is C.