PSY 230 Lecture Notes - Lecture 9: Null Hypothesis, Standard Score, Standard Deviation

57 views2 pages

Document Summary

Distribution of means of a very large number of samples of the same size, taken at random from population: mean: (cid:0, variance: (cid:0) Z test: changing sample mean z score is the same as changing raw score z score. But be careful with all of these means! Z score formula: z = (m - (cid:0) Example of z test: sample mean is 18; distribution of means has mean of 10, standard deviation of 4. What is the sample"s z score: z = (18 10) / 4 = 8 / 4 = +2. Example: 1 predict that we will find someone else more physically attractive if we are first told that this person has positive personality qualities. Have lots of student"s rate picture on 0 (lowest attractiveness) to 400 (highest) scale. Don"t mention personality: mean = 200, standard deviation = 48, normal distribution. Mention personality to randomly- selected 64 students (sample)

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers

Related Documents