Indicate which of the following choices best identifies the hypothesis test.


a. independent group means, population standard deviations and/or variances unknown

b. matched or paired samples

c. single mean

d. two proportions

e. single proportion


A powder diet is tested on 49 people, and a liquid diet is tested on 36 different people. The population standard deviations are two pounds and three pounds, respectively. Of interest is whether the liquid diet yields a higher mean weight loss than the powder diet.