(Answered) Question the effects of two stimulant drugs an experimenter

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Question: The effects of two stimulant drugs. An experimenter was interested in investigating the effects of two stimulant drugs (labeled A and B). She divided 20 rats equally into 5 groups (placebo, Drug A low, Drug A high, Drug B low, and Drug B high) and, 20 minutes after injection of the drug, recorded each rat's activity level (higher score is more active). The following table summarizes the results:

(a) Plot the means versus the type of treatment. Does there appear to be a difference in the activity levels? Explain.

(b) Is it reasonable to assume that the variances are equal? Explain your answer, and if reasonable,
compute sp.

(d) The F statistic is 4.28. Find the associated P-value and state your conclusions.

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