A new​ weight-loss program claims that participants will lose an average of more than 10 pounds after completing it. The data table shows the weights of five individuals before and after the program.
1 2 3 4 5
before 264 220 285 264 195
after 240 223 267 250 75
We need to test the hypothesis that the population mean of differences exceed 10. That is, Use 5% level of significance. Find the test statistic.