An article in the journal Applied Nutritional Investigation reported the results of a comparison between a low-calorie soy-protein diet and a low-calorie traditional-protein diet (Liao, 2007).Twelve obese participants were randomly assigned to each diet.At the end of the diet period, those on the soy diet lost an average of 2.3 percent of their body fat (SD = 0.55), while those on the traditional diet lost an average of 1.22 percent of their body fat (SD = 0.50).If the sample size of this study is increased, the value of the test statistic would _____ and the effect size would _____.
A) increase; remain the same
B) decrease; remain the same
C) decrease; increase
D) increase; decrease

Question

Quizplus · Accepted Answer

Increasing the sample size would likely strengthen the evidence and make it easier to detect a significant difference between the two diets, leading to an increase in the value of the test statistic. However, the effect size is a measure of the magnitude of the difference between the two groups, and it would likely remain the same because the results of the study are unlikely to change with a larger sample size. Therefore, the correct answer is A, as the value of the test statistic would increase while the effect size would remain the same.

An Article in the Journal Applied Nutritional Investigation Reported the Results