STATS_ PPT lec 13-22.pdf - Lecture 13 1 Standard deviation vs Standard Error a SE-how sample means vary b SD how much observations vary 2 Standard

STATS_ PPT lec 13-22.pdf - Lecture 13 1 Standard deviation...

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Lecture 13 1. Standard deviation vs Standard Error a. SE-how sample means vary b. SD- how much observations vary 2. Standard Deviation a. Calculated from the sample data b. Measures the amount of variability in the sample data c. Is an unbiased estimator of the true population std deviation 3. Standard Error a. Measure of how variable sample means are in general b. Standard deviation of the sampling distribution c. 4. Significance a. Numerical difference does not imply statistically significant difference 5. Research process (TUNA TEA) a. T hink U p a research question (collect data) b. State N ull c. State A lternative d. Choose the appropriate statistical t est i. Calculate the test statistic ii. (Does the test support the null or alternative?) e. E valuate Extremeness, i. Explain your conclusion in English f. A ssess 6. Polio Example: a. Think up a question i. Does the polio vaccine help prevent polio b. State the Null: i. Vaccinated and non vacianaed children have the same subsequent polio rated c.

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• Spring '14
• JWalcott

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