Backfat thickness is a variable used in evaluating the quality of market hogs. An animal scientist measured backfat thickness (cm) on hogs raised on two different diets, with the following results (see attachment):
Diet 1 Diet 2
X 3.49 3.05
Sx 0.40 0.40
Use the t test (a=0.01) to compare the average backfat for the two diets, assuming the number of hogs on each diet was:
The hypothesis that the average backfat thickness for two diets are different has been tested.