A dietician wanted to help her patients be more successful in losing weight. To that end, she developed a new diet plan. She advertised her study and was able to find 80 participants who fit the study requirements. She randomly assigned those participants to either follow her new diet for two months or to follow her standard meal plans. After two months, the participants returned, and she assessed the percentage of weight lost. Her research question was: Were the participants who followed the new diet program more successful in losing weight than those who followed the standard plan? The researcher collected the actual weight loss in pounds to the nearest 0.1 pound. what test should be used in this case and why