Two different brands of golf balls are being tested by ProGolf Associates to determine if

one travels farther than the other. Ten randomly selected Hyperdive balls are selected for

the test along with and another 10 randomly selected Score 60 balls. The balls in each

sample are struck with equal force by a robotic driver. The average distance for the

Hyperdrive balls in the sample is 252 yards, with a standard deviation of 4.9 yards. The

Score 60 balls in the sample have an average distance of 246 yards, with a standard

deviation of 5.4 yards.

Set up a hypothesis test to test a null hypothesis that there is no difference in the average

distance for the two brands of balls. Assume that the population distributions are normal

and that the population standard deviations are equal. Compute the value of the test

statistic, tstat, for the sample result.




D. 2.28