Data on the weights (lb) of the contents of cans of diet soda versus the contents of cans of the regular version of the soda is summarized to the right. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Use a 0.01 significance level for both parts.

Diet Regular
u u1 u2
n 26 26
x 0.7928 0.8111
s 0.0044 0.0075

the test statistic, t is