One sample is selected to represent scores in treatment 1 and a second sample is used to represent scores in treatment 2 . Which set of sample statistics would present the clearest picture of a real difference between the two treatments?
a. M1 = 36, M2 = 40, and both variances = 43
b. M1 = 36, M2 = 40, and both variances = 6
c. M1 = 38, M2 = 40, and both variances = 43
d. M1 = 38, M2 = 40, and both variances = 6
Question 2
There is a 6-point difference between two sample means. If the two samples have the same variance, which of the following values would make the mean difference easiest to see in a graph showing the two distributions?
a. s2 = 2 c. s2 = 16
b. s2 = 8 d. s2 = 64
A treatment for blocked blood vessels.
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