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Unformatted text preview: Descriptive statistics gives us averages (means) as well as measurements of how variable the data are (standard deviations) In inferential statistics we propose a null hypothesis vs. an alternative hypothesis. Doing statistics Hypotheses are small questions. The normal distribution Area under the curve = 1 Middle of the curve is the mean, 0 in the "standard" normal distribution variation is indicated by standard deviation z-score indicates the number of standard deviations away from the mean the a score is About 5% of the curve is 2 or more standard deviations from the mean Central limit theorem: The distribution of sample averages approaches the normal distribution as the sample size increases (It's a theorem, that means it can be proven, it's not just an idea)...
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This note was uploaded on 04/14/2011 for the course BIO 120 taught by Professor Stark during the Fall '08 term at Saint Louis.
- Fall '08