A social psychologist compares three kinds of propaganda messages on college stu

Question

A social psychologist compares three kinds of propaganda messages on college students’ attitudes toward the war on terrorism. Ninety (N = 90) students are randomly assigned in equal numbers to the three different communication conditions. A paper-and-pencil attitude measure is used to assess students’ attitudes toward the war after they are exposed to the propaganda statements. An ANOVA is carried out to determine the effect of the three messages on student attitudes. Here is the ANOVA Summary Table

Source   

Sum of Squares

df

Mean Square

F

p

Communication     

180.10

2

90.05

17.87

0.000

Error

438.50

87

5.04

Is the result statistically significant? Why or why not?

Source   

Sum of Squares

df

Mean Square

F

p

Communication     

180.10

2

90.05

17.87

0.000

Error

438.50

87

5.04

Explanation / Answer

Since the p-value is 0.00 i.e. less than 0.05, we should reject the null hypothesis as there is no difference between the means and conclude that a significant difference does exist.

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