12correlation.stud08-1

12correlation.stud08-1 - Psych 305 Week 7 Correlation(and...

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Psych 305 Week 7 Correlation (and implications for your survey project)
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Before coming to this class, you should know what a z-score is, what it means, and how to compute it. That is an important foundation for what we will do in this lecture.
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Goals for Today’s Class At the end of the class you should: Understand what a correlation measures. Be able to draw a scatter diagram and estimate (generally) the correlation. Be able to compute a Pearson-product moment correlation and interpret what it means. Understand some limitations on the use of correlations. Be able to read and interpret a correlation matrix. Use what you have learned about measures of correlation to help you design a better survey.
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Levels Naturalistic Observation Case-Study Method Correlational Research Differential Research Experimental Research Vs. Correlation (a statistic)
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Where we’ve been and where we are going. .. X -- one variable Y -- one variable
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Whaddaya Mean What Goes With What? How physically fit are you? 1 2 3 4 5 6 7 |----------|-----------|------------|------------|------------|-------------| not at all somewhat very much How many times a week do you get vigorous physical exercise (e.g., go running, go to the gym, play sports)? (write in a number) _______________ How many times per week do you eat at a fast-food restaurant? (write in a number) ______
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Descriptive Statistics (simplify, summarize, and organize data) 1. frequency distributions 2. graphical representations of data 3. summary statistics a. measures of central tendency b. measures of variability c. measures of relationship (2 + variables)
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Some Data from Your Survey Person How Fit # Vig A 4 5 B 5 6 C 3 2 D 4 5 E 7 5 F 2 2 G 4 1 H 5 4
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Scattergram 1 Scattergram -1 0 1 2 3 4 5 6 7 8 How Fit Do You Think You Are? 1 2 3 4 5 6 7 8 Times Per Week of Vigorous Exercise Fit Vig 4 5 5 6 3 2 4 5 Etc. ..
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-1 0 1 2 3 4 5 6 7 8 Times Per Week of Vigorous Exercise 1 2 3 4 5 6 7 8 How Fit Do You Think You Are? Scattergram
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12correlation.stud08-1 - Psych 305 Week 7 Correlation(and...

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