Myers Chapter 1 (F): Statistics in Psychological Research: Measures of Central Tendency A.P. Psychology.

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Presentation transcript:

Myers Chapter 1 (F): Statistics in Psychological Research: Measures of Central Tendency A.P. Psychology

Do-Now: (In Journal) What are statistics? Why are statistics important in social sciences? How are the following measures of central tendency found? Mean Median Mode

Statistics in Psychology The collection, classification, analysis, and interpretation of numerical psychological data Descriptive Statistics: Describes collected data Frequency Distribution: Bar Graph Histogram

Statistics in Psychology Types of Psychological Data: Nominal: Categorical Non-numerical; cannot compute mean Bar graph E.g. Favorite ice cream flavor Ordinal: Ordered E.g. 1st place, 2nd place, 3rd place

Statistics in Psychology Can you think of another example of Nominal and Ordinal data?

Statistics in Psychology Types of Psychological Data: Interval: Equal interval between points; no true zero point Numerical; can compute mean Histogram E.g. Degrees in Fahrenheit Ratio: true zero point E.g. Height/weight

Statistics in Psychology Can you think of another example of Interval and Ratio data?

Measures of Central Tendency Mean: The arithmetic average of a distribution Obtained by adding all scores together, and dividing by the number of scores Median: The middle score of a distribution Half of the scores are above it and half are below it Mode: The most frequently occurring score(s) in a distribution

Distributions Normal Distribution: Symmetrical, Bell-shaped distribution Mean, Median, Mode all are the same

Distributions Skewed Distribution: Positively skewed; “Skewed to the Right” Negatively skewed; “Skewed to the Left”

Distributions What types of situations might cause a “positively-skewed” distribution? What types of situations might cause a “negatively-skewed” distribution?

Positively Skewed Distribution Distributions Positively Skewed Distribution

Review Differentiate between the following types of data: Nominal Ordinal Interval Ratio What is a normal distribution? What is the difference between a positively and negatively-skewed distribution?

Homework Unit 2 FRQ Unit 2 Test: “Research Methods” Chapter 2 Outline: “The Biology of Mind”