Suppose a Researcher Is Testing a New Diet Drug

Essay

Suppose a researcher is testing a new diet drug. She would like to determine if the drug helps to significantly increase weight loss versus a placebo. She randomly assigns 40 participants to the treatment group and 35 to the placebo group. After 4 weeks on identical diets, the mean weights loss (in pounds) for each group is computed. Results of the study are as follows:
Treatment Group
Placebo Group
n = 40
n = 35
= 5.6
= 1.6
s = 2.85
s = 1.47
Create a 95% confidence interval for the difference of treatment effects.