A new fitness program is devised for obese people. Each participant's weight was measured
before and after the program to see if the fitness program is effective in reducing their
weights.
In this example, our null hypothesis is that the program is not effective, i.e., there is no
difference between the weight measured before and after the program. The alternative
hypothesis is that the program is effective and the weight measured after is less than the
weight measured before the program. The dataset can be obtained here.
In the data, the first column is the weight measured before the program and the second