Statistics for Psychology!. Refresher With a partner, define all of these terms: – Mean – Median...

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Statistics for Psychology!

Transcript of Statistics for Psychology!. Refresher With a partner, define all of these terms: – Mean – Median...

Page 1: Statistics for Psychology!. Refresher With a partner, define all of these terms: – Mean – Median – Mode – Population – Sample – Variable – Range Which.

Statistics for Psychology!

Page 2: Statistics for Psychology!. Refresher With a partner, define all of these terms: – Mean – Median – Mode – Population – Sample – Variable – Range Which.

Refresher

• With a partner, define all of these terms:– Mean– Median– Mode– Population– Sample– Variable– Range

Which 3 are measures of central tendency???

Page 3: Statistics for Psychology!. Refresher With a partner, define all of these terms: – Mean – Median – Mode – Population – Sample – Variable – Range Which.

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.

Page 4: Statistics for Psychology!. Refresher With a partner, define all of these terms: – Mean – Median – Mode – Population – Sample – Variable – Range Which.

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

Page 5: Statistics for Psychology!. Refresher With a partner, define all of these terms: – Mean – Median – Mode – Population – Sample – Variable – Range Which.

Calculating Standard Deviation

Page 6: Statistics for Psychology!. Refresher With a partner, define all of these terms: – Mean – Median – Mode – Population – Sample – Variable – Range Which.

Normal Distribution

Page 7: Statistics for Psychology!. Refresher With a partner, define all of these terms: – Mean – Median – Mode – Population – Sample – Variable – Range Which.

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

Page 8: Statistics for Psychology!. Refresher With a partner, define all of these terms: – Mean – Median – Mode – Population – Sample – Variable – Range Which.

Skewed DistributionsA 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).

Page 9: Statistics for Psychology!. Refresher With a partner, define all of these terms: – Mean – Median – Mode – Population – Sample – Variable – Range Which.

Using Deviations and Curves