Exercise

Grubbs' test

We've now checked that the data are normal. Now let's apply Grubbs' outlier test!

Grubbs' test assesses whether the value that is farthest from the mean is an outlier - the value could be either the maximum or minimum value. The test is performed using the grubbs.test() function from the outliers package:

grubbs.test(x)

x is the input data as a numeric vector

Instructions

100 XP

Run the Grubbs' test on the nitrate concentrations.