Refer to Example 14.3.1. Suppose we use the transformation yi = ln xi for each observation.
(a) Test whether the transformed data are normal.
(b) Determine whether the data value 18 is still an outlier in the transformed data set.
Example 14.3.1
The following data give the hours worked by 25 employees of a company in a randomly selected week.

Label all possible outliers using:
(a) z-Score test, distribution-free test, and modified z-score test.
(b) Box plot.

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45 40 39 36 42 40 55 58 42 41 48 50 47 54 40 34 18 40 60 56 42 43 46 43 54