- Write an R function that performs the Gehan test for the large-sample approximation.

-Function should return an object that contains the test statistic, the p-value, and the

method.

-The print method should output: the name of the test (Gehan), the method used, the test

statistic, and the p-value.

- Comment your code. Including a description of the function(s), the type and format of

the arguments, and a description of the values returned. Your comments should act like

a manual for how to use the function. Also include comments in the body of the

function that describe what is going on.

- Apply your function to the following large-sample dataset.

Dataset 1

Background: 4 <18 13 27 39 11 <23 <6 <3 9 29 <19 36

Site: 49 10 <17 <28 50 30 32 20 <26 34 37 48 45

A < denotes non-detect data, in which case the detection-limit is given.