An experimenter was interested in investigating the effects of two stimulant dru

Question

An experimenter was interested in investigating the effects of two stimulant drugs (labeled A and B). She divided 25 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) Give the degrees of freedom for the F statistic:

numerator df = ____

denominator df = _____

(b) The F statistic is 4.77. Find the associated P-value. (Round your answer to four decimal places.)

P-Value = _____

Treatment 2 Placebo Low A High A Low B High B 15.00 15.75 18.50 16.25 22.75 8.75 12.25 12.75 6.75 11.00

Explanation / Answer

a)

numerator df = 4

denominator df = 124

b) p Value=0.0000

SS df MS F p Between: 983.125 4 245.781 23.844 0 Within: 1,236.93 120 10.308 Total: 2,220.06 124

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