Concept explainers
The correct option that would cause the most worry about the validity of confidence interval is (a) there is a outlier in the data, (b) a stem plot of the data shows the right skew, (c) you do not know the population standard deviation
Answer to Problem 78E
The correct option is (a).
Explanation of Solution
If the population standard deviation is unknown, then it is assuming in the t-procedure. But the drawbacks of the t-procedure are various outliers and skewness. Thus, there will be a clear outlier in the data in the confidence interval.
Hence the correct option is (a).
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