Standard Deviation vs. Standard Error |

(M1.ST.14.71) A study comparing the efficacy of four different weight loss diets is conducted. The primary outcome is change in weight (in kilograms) after two years. Prior to the study, there was insufficient evidence to conclude that any of the diets were effective. Figure A reports the mean weight change and the 95% confidence intervals (CI) for each of the four diets. Which of the following diets would have a p value < 0.05?