Question

A study was done using a treatment group and a placebo group. The results are shown in the table. 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. Complete parts? (a) and? (b) below. Use a 0.01 significance level for both parts.

treatment, u1, n=25, x=2.35, s=.52

Placebo, u2, n=39, x=2.68, s=.92

Test statistic, t, is=

P value=

?<u1-u2<?

Reject?

Answer 1

The statistical software output for this problem is:

Hence,

Test statistic = -1.83

P value = 0.0721

99% confidence interval:

-0.81 < u1 - u2 < 0.15