PDF Lecture 3 - Correlations and Experiments.pdf

PDF Lecture 3 - Correlations and Experiments.pdf - Research...

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Research Methods, Part 2: Correlations and Experiments Psych 85-102: Intro Psych Dr. Kody Manke January 23, 2018
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Announcements Emails to professors. Exit Tickets OLI HW #2 Due tonight by midnight Writing Assignment #1 Due next Tuesday – will post later this afternoon
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Writing Assignment #1 Two questions about research methods First, you will critique a researcher’s study design and conclusions, and design a study that improves the study design Second, you will read an article about a research study and answer questions about its design (what were the IV and DV, etc.)
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Let’s play a game…
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Two types of studies Correlational Measure how two pre-existing variables relate Experimental Change or manipulate one variable to see how it relates to another variable
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Variables in Experiments Independent variables (IVs): A variable that you change or manipulate , in order to see whether changing it affects another variable Dependent variables (DVs): The variable that depends on your changes made to the independent variable – is this variable affected by changes in the other variable?
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Design Creative IVs and DVs How would you manipulate… Anxiety Loneliness Concentration How would you measure… Happiness Generosity Perfectionism
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Interpret results The scientific method Test hypothesis How will I test my theory? How will I measure my variables? What specific results do I predict?
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Interpret results The scientific method Carry out test of theory’s predictions Record observations / collect data
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Correlation
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Correlation
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Positive r = 0.8 0 15 30 45 60 75 90 2 4 6 8 10 12 14 16 18 20 0 Number of fights during the school year Hours of video games played per month
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The scientific method Did the results support the hypothesis? Are there other explanations for the results? Test hypothesis
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Ice cream consumption leads to murder?
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… Probably not! Correlation is different from Causation Three stories: X à Y Y à X Z à both X and Y
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Positive r = 0.8 0 15 30 45 60 75 90 2 4 6 8 10 12 14 16 18 20 0 Number of fights during the school year Hours of video games played per month
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