Looking at Four Different Diets,a Researcher Randomly Assigned 20 Equally $$\bar { x }$$

Essay

Looking at four different diets,a researcher randomly assigned 20 equally overweight adults into each of the four diets.The response was weight loss,in kilograms.The MSE = 31.4 and $$\bar { x }$$ = 14.25, $$\overline { x _ { 1 } } = 10.6$$ , $$\bar { x } _ { 2 } = 12.8$$ , $$\bar { x } _ { 3 } = 12.4$$ , $$\bar { x } _ { 4 } = 21.2$$ .
-Compute a 95% confidence interval for the fourth group (diet)mean.