PSY 1101 Lecture Notes - Lecture 3: Explained Variation, Logical Positivism, Central Tendency

• School: University of Ottawa
• Department: Psychology
• Course: PSY 1101
• Professor: Kenneth Campbell

Document Summary

There are usually (almost always) individual differences in the dependent measure. The mode is the score that occurs most often. The mean is the average of all score. The median is the score at which half the individual score above and half score below. At times our measures are not normally distributed. extremely high (or low) score might distort the average (or mean) In this case the median might be a better measure of central tendency. Fact: on average, women have lower salaries than men. A change in one variable is also associated with a change in another. Example : geese and leaves ; smoking and cancer; testosterone and violence; heroin and marijuana. Note: this does not mean that change in one variable causes the other variable to change. Correlation - a statistical measure of the extent of a relationship between two variable. The correlation allows one to predict scores on one variable if the score on another variable are known.