Now let consider only the maids who were informed. Here is a display of their body mass index (BMI), a measure of body fat, at the start (BMI) and at the end (BMI2) of the study.
Which of these is the best comment to make about this display? 1. This is not an appropriate plot for this study. 2. This bar chart has three outliers. 3. These boxplots show that informing the maids made no difference in their BMI. 4. The maid with the highest BMI was the same at the start of the study and at the end. 5. There is a significant drop in the median BMI over the four-week study.