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6 Cards in this Set
- Front
- Back
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What is research?
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Research is a systematic attempt to provide answers to questions.
As such, research may be basic or applied. |
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What is a statistic?
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A statistic is a value that is computed on a sample.
A parameter is a value that is computed on a population. |
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Why use samples?
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Analyzing samples is more cost effective than analyzing populations,
And if done correctly just as accurate. Just remember the next time the doctor wants to do a blood test, would you want him to test all of your blood or just a small sample? |
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What is statistics?
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Statistics is the science of collecting, organizing, and interpreting numerical facts called data.
Data - Data are numbers with a context. Descriptive Statistics/Exploratory Data Analysis Inferential Statistics Causal inferences Experimental units -> subjects Control groups Random assignment Probability - the chance or likelihood that an event will occur. Bias - Systematically favoring certain outcomes. |
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Riddle: What is a statistician?
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A researcher who draws mathematically precise lines from unwarranted assumptions to foregone conclusions.
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What is research validity?
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Internal vs External Validity
Internal Validity -- A research study or experiment has internal validity if the outcome is a function of the variables that are measured, controled or manipulated in the study. Did in fact the experimental treatments make a difference in the study? External Validity -- A research study or experiment has external validity if the results obtained would apply to other similar programs or approaches. |
