A developmental psychologist was interested in examining the number of aggressiv

Question

A developmental psychologist was interested in examining the number of aggressive acts displayed by children after watching a certain type of movie. A child experienced one of the four situations: 1. No movie (control) 2. Viewed Snow White (only) 3. Viewed Alien (only) 4. Viewed Rambo (only) a. Your assignment is to perform a one-way ANOVA (show the summary table and all work). Draw the conclusions. b. You will also need to complete a set of orthogonal comparisons. The researcher was interested in testing whether seeing a movie would have more aggressive acts for children than not seeing one (control). Likewise, the researcher wanted to test whether the animated picture (Snow White) would yield less aggressive acts for children than the action films. There is also another comparison that will be left to you. Provide the summary table and conclusions. c. Use the same comparisons for the Scheffe test. Provide a separate summary table for the Scheffe test and draw conclusions from this study using this test.

Explanation / Answer

a.

The p-value is less than 0.05, we reject the null hypothesis and concluded that there is means difference in variables.

Anova: Single Factor SUMMARY Groups Count Sum Average Variance Column 1 10 56 5.6 5.155556 Column 2 10 47 4.7 7.566667 Column 3 10 232 23.2 14.84444 Column 4 10 41 4.1 8.322222 ANOVA Source of Variation SS df MS F P-value F crit Between Groups 2550.6 3 850.2 94.75913 3.79E-17 2.866266 Within Groups 323 36 8.972222 Total 2873.6 39

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