One sample is selected to represent scores in treatment 1 and a second sample is used to

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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 mean difference between the two treatments?

a. M1 5 40, M2 5 45, and both variances 5 15

b. M1 5 40, M2 5 45, and both variances 5 3

c. M1 5 40, M2 5 42, and both variances 5 15

d. M1 5 40, M2 5 42, and both variances 5 3

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