Psych 10/23

Doll Study

Fed, time shown, number of times shown, time of day, person showing the doll,

Sample group: race, gender, religion, city or rural

Random Sample: random group chosen from a given population (students from brooklyn college)

Random Assignment: from sample, randomly assign participants to sub groups

Cause and Effect: Statistical Tendency, Random Assignment

If p-value is small (under 0.5) the observed mean scores were not coincidental

Correlation is not Causation

Correlation Designs

Methods and Trade-Offs

Build a Study

Correlation

Random 100 people and have them exercise

Materials: commercial gym-goers

Measures: how many minutes of exercise, mood rating before and after workout (general question), over a set period of time (30 days)

Data Collection: surveys (1-10 scale grading mood)

Strengths: if positive correlation, okay assumption to make

Weaknesses: existing mental condition (?), other variables to test, not strong conclusion to make, mood that day

Quasi Experimental

Group: Group that exercises and control group

Materials: Controlled area with same/similar exercise equipment

Measures: subjective rating of their mood and compare data from control to exercise group

Time: 3 months (test during the summer)

Strengths: can investigate possible relationship when comparing control group and experimental group

Weakness: existing mental conditions, no randomization, what if person does not enjoy exercise, if aware of experiment there may be confirmation bias