Main Experimental Condition Assignment

Means for Main Personality Scales for Each Experimental Condition Assignment

An experiment is conducted in which 60 participants each fill out a personality test, but not according to the way the participants see themselves. Instead, 15 are randomly assigned to fill it out according to the way they think theur mothers see them (that is, the way they think their mothers would fill it out to describe the participants); 15 as their fathers would fill it out for them; 15 as their best friends would fill it out for them; 15 as the professors they know best would fill it out for them. The main results appear in Table 9-17. Explain these results to a person who has never had a course in statistics.

Means for Main Personality Scales for Each Experimental Condition
Scale Mother Father Friend Professor F(3, 56)
Conformity 24 21 12 16 4.21**
Extroversion 14 13 15 13 2.05
Maturity 15 15 22 19 3.11*
Self-Confidence 38 42 27 32 3.58*
*p < .05, **p < .01 24. Rosalie Friend (2001), and educational psychologist, compared three methods of teaching writing. Students were randomly assigned to three different experimental conditions involving different methods of writing a summary. At the end of the two days of instructions, participants wrote a summary. One of the ways it was scored was the percentage of specific details of information it included from the original material. Here is a selection from her article describing one of the findings: The effect of summarization method on inclusion of important information was significant F(2, 144) = 4.1032, p < .019. The mean scores (with standard deviations in parantheses) were as follows: Argument Repetition, 59.6% (17.9); Generalization, 59.8% (15.2); and Self-Reflection, 50.2% (18.0). (p.14) a. Explain these results to a person who has never had a course in statistics. b. Using the information in the preceding description, figure the effect size for the study.