# Psychology 1000 Lecture Notes - Lecture 11: Central Tendency, Frequency Distribution, Standard Deviation

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14 Nov 2012

School

Department

Course

Professor

Psychology 1000

Statistics

- Distributions

- Central Tendency

- Variability

Next Time: Review

Read: Chapter 1-4 + Appendix

1) How do statistics help us understand data?

2) How do you calculate measures of central tendency?

3) What does variance mean?

- Statistics are a way to simplify distributions

- Simplify with a few numbers (Statistics)

Mean (); M

- add up numbers and divide by N (the number of students)

Median

- middle number in the distribution

- n + 1 / 2

- take two middle numbers and divide by 2

Mode

- most frequent score

- Easy to identify from frequency distribution

Note:

~ MDN ~ MODE

- Shape

- If the three numbers are close to each other than there will be a bell curve shape