Researchers are interested in determining if a new exercise regimen helps people lose weight. They recruit 22 participants and find that they have an average weight of 164.3 pounds. After implementing the exercise regimen for a month, the researchers find that the participants had an average weight of 155.9 pounds. Therefore, the mean difference between groups ( ) is -8.4 pounds. (That is the average change in weight from before the exercise regimen to after the exercise regimen.) The standard deviation of difference scores ( ) was 25.7 pounds. At a significance level of .05, did the exercise regimen cause participants to lose weight? Be sure to compute the standard error of the difference scores ( ) to use in the equation for computing t