Psychology 1000 Lecture Notes - Fall 2018 Lecture 3 - Standard deviation, Factor analysis, Null hypothesis

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Mike

Document Summary

Descriptive stat: what do we have: distributions of scores. Scores on the anxiety scale ranged from 3. 6 to 17. 7, with an average of 10. 1(sd=1. 5) : group averages, differences between group averages. The mean score on the measure of anxiety was 7. 4(sd=1. 2) in the control group, and. 12. 3(sd=1. 7) in the treatment group: correlation between variable. Anxiety score were highly correlated with neuroticism scores(r=. 54)") Inferential stat: what does it mean: statistical significance(p-value: the estimate of finding the likelihood that we found) If we re-ran the study, what is the likelihood that we would find the same thing: effect size. What is the magnitude of the observed effect. Histogram: measures of central tendency, single number to describe the data set. Median= middle" score;halfway point(when all scores arranged in order) Range: highest score minus lowest score, -=189000. Standard deviation(sd: measure of how widely spread the data are, variance=sd^2, normal curve, visual representation of the distribution.