1. Statistics for Psychology!

2. Which 3 are measures of central tendency???
Refresher 
With a partner, define all of these terms:
Mean
Median
Mode
Population
Sample
Variable
Range
Which 3 are measures of central tendency???

3. Central Tendency Mean, mode, median
A measure of central tendency is a way of specifying - central value.
Measures of central tendency are measures of the location of the middle or the center of a distribution.
The mean is the most commonly used measure of central tendency.

4. Standard Deviation Measure of diversity or dispersion
Measures variability
It shows how much variation or "dispersion" there is from the average (mean, or expected value).
The measures in a study can be placed on a curve
Normal curve
Skewed curves

5. Calculating Standard Deviation

6. Normal Distribution
6 minutes, 18 seconds

7. To Remember – Normal Curve
Mean, mode, and median all fall dead center
Normal curves measure within 3 deviations to the positive and negative (to the right and left)
99.5% of all data will fall within 3 deviations
95% of all data will fall within 2 deviations
68% of all data will fall within 1 deviation

8. Skewed Distributions A skewed distribution is a frequency graph that is higher on one side than the other. For instance, a graph of the frequency of ages of people eating Trix cereal is probably higher in the younger ages than the older ages (positively skewed). A graph of the frequency and ages of people eating Fiber cereal is probably higher in the older ages (negatively skewed).
1 minutes, 37 seconds

9. Using Deviations and Curves
8 minutes, 34 seconds