1. Psychology’s Statistics Psychology’s Statistics Appendix (page A1 - A13)

2. Statistics  purpose: make data more meaningful  provide a method of organizing information so that it can be understood

3. Frequency Distribution  list of scores placed in order from highest to lowest

4. Three Main Types of Statistics  Descriptive Statistics  Comparative Statistics  Inferential Statistics

5. Descriptive Statistics

6.  used to describe the basic features of the data in a study  2 Main Types:  Measures of Central Tendency  Measures of Variation

7. Measures of Central Tendency  statistical methods for finding the center of a distribution  three methods:  Mode - most frequently occurring score  Mean - average of a distribution  Median - middle score in a ranked distribution

8. Measures of Variation  variation – how spread-out scores are  Example: range - difference between the highest and the lowest scores in a distribution

9. Inferential Statistics Inferential Statistics

10. Inferential Statistics  can be used to make a decision or reach a conclusion about data  correlations:

11. Statistical Significance  statement of how likely it is that a result occurred by chance  For something to be statistically significant, the possibility that the difference between groups would occur by chance alone is not more than ____ % 5

12. END CLASS NOTES

13. Favorite Subject Survey (& Statistics)  Working with your group, create a 5 question survey to determine views on the subjects taught at North Cobb High School.  Answers to your survey questions should be a range from 0 – 5 with 0 representing HATE the subject and 5 representing LOVE the subject.  Administer the survey to 3 students in the class

14. Favorite Subject Survey (& Statistics) Now analyze your data:  Make a frequency distribution for each of the five subjects.  Compute the mean, median, & mode for each of the five subjects.  Compute the range for each subject.