L5 - research.360_1

L5 - research.360_1 - Hypothesis Testing Thinking as...

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Hypothesis Testing Thinking as scientists
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Thinking like a scientist Hypothesis Hypothesis testing Role of theories Goals of hypothesis testing Hypotheses about the Midway case?
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Steps of hypothesis testing 1. Defining your variables 2. Selecting a sample 3. Selecting a research design 4. Determining measurement 5. Analyzing data 6. Making conclusions about whether your hypothesis is confirmed or not.
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1. Defining your variables What is a variable? Participant (or measured) variable Manipulated variable Continuous vs. grouping variable Operational definition
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Examples Manipulated or participant variable? Weight? Gender? Length of treatment? Room temperature? Anxiety? Grouping or continuous variable?
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Example Hypothesis: successful women are paid higher salaries. Operational definition of “success”? Operational definition of “high salary”?
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2. Selecting a sample Population Sample Representative sample Random sample Sample size Chance variability…
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Chance variability Population : USC undergraduates Average Age = 21.3 years Average IQ: 112.5; 65% female Sample 1 : Eric, Jess, Laura, Karen, and Brian Average Age = 19.8 years Average Sample 2 : Tom, Kristen, Sara, Drew, and John Average Age = 20.4 years Average IQ: 114.2
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2. Selecting a sample Biased sample Convenience sample Volunteer bias
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3. Selecting a research design Case study Non-experimental research Experimental research Meta-analysis
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Definition When used? Pros?
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L5 - research.360_1 - Hypothesis Testing Thinking as...

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