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A researcher would like to examine how the chemical tryptophan, contained in foods such as turkey, can affect mental alertness. A sample of n =

A researcher would like to examine how the chemical tryptophan, contained in foods such as turkey, can affect mental alertness. A sample of n = 16 college students is obtained and each student's performance on a familiar video game is measured before and after eating a traditional Thanksgiving dinner including roast turkey. The average score dropped by M = 9 points after the meal with SS = 1200 for the difference scores. a. Is there is significant difference in performance before eating versus after eating? Use a two-tailed test with = .05. b. Compute r 2 to measure the size of the effect. c. Write a sentence demonstrating how the outcome of the test and the measure of effect size would appear in a research report.

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