Question

2. Suppose we wanted to test the hypothesis that a control group of cancer patients (Group 1) would report higher mean pain ratings than an experimental group receiving special massage treatments (Group 2). Use the following information. Compute a t-statistic for independent groups:

            Remember: SD² is the variance, which is the square of the standard deviation. If you are using the formula on page 116, you will use the variance, as given. If you are using the easier, preferred method with StatCrunch (with summary), you will want to use the standard deviation (square root of the variance).

            mean group 1 = 82.1               SD²₁ = 42.1     n₁ = 25

            mean group 2 = 74.1               SD²₂ = 39.7     n₂ = 25

            What are the degrees of freedom and the value of t ? Using α=0.05 for a two-tailed test, is this t statistic significant?

Answer 1