A researcher randomly assigned 160 subjects into one of two groups: Atkins diet or Weight Watchers. The response variable was weight change in pounds after 6 weeks. The t-test results showed a p-value=.049. What can be concluded?
a. One diet led to greater weight loss than the other
b. The mean weight loss was better for the Weight Watcher group
c. Descriptive data are needed before an accurate conclusion can be made
d. There was evidence to suggest the diets differed in mean weight change