Exercise

# Plotting results

In the previous exercises, you have examined the raw data, used the data to build a model, and applied the model for statistical inferences. You found drug 2 increased the amount of extra sleep compared to drug 1. During this exercise, you will plot the results to see how much drug 2 increased extra sleep.

First, wrangle the data by using `pivot_wider()`

function from the `tidyr`

package. Then, calculate the difference in extra sleep for each individual. Last, plot this difference as a histogram.

Instructions 1/2

**undefined XP**

- Load the
`tidyr`

package. - Spread the data and save the results as
`sleep_wide`

. - Calculate the difference and save this as the column
`diff`

.