Weight losses of 81 individuals on the first 30 days on a diet averaged 8.2 lb with sample variance of 4 lb2 • (a) Find a 99% confidence interval for µ, the true average loss of individuals on this...

Weight losses of 81 individuals on the first 30 days on a diet

averaged 8.2 lb with sample variance of 4 lb2 •

(a) Find a 99% confidence interval for µ, the true average loss

of individuals on this diet.

(b) The diet orginator claims that the true average weight loss

in the first 30 days is 10 lb. Do the data support this

assertion? Why or why not?