Question: When testing for a difference between the means of a treatment group and a group given a placebo, the following Excel display is obtained. Using

When testing for a difference between the means of a treatment group and a group given a placebo, the following Excel display is obtained. Using a 0.02 significance level, is there sufficient evidence to support the claim that the treatment group (Variable 1) comes from a population with a mean that is different from the mean for the placebo population? Explain.

1 z-Test: Two Sample for Means 2 Variable Variable 2 4 Mean 5 Known variance 6 Obsevations 7 Hypothesized mean difference 75.34798 73.81763 1.55383 11.65292 50 50 P(Z

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Original claim 1 2 0 n 1 30 and n 2 30 use z with ss for s x 1 x 2 7534798 7381... View full answer

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