Biology 2244A/B Study Guide - Central Limit Theorem, F-Test, Block Design
8 Jan 2015
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Types of sampling design: srs, stratified sample: divide entire population into strata"s, and randomly select the final subjects proportionally from the strata"s (all strata"s are picked, cluster sample, systematic. Types of observational study design: case control: case-subjects are compared to a control group, cohort study: subjects sharing a common demographic characteristic are enrolled and observed at regular intervals over long periods of time. One subject gets on treatment, other gets control/ placebo etc: can give both treatments to same person (repeated measures) Statistically significant: difference in conditions could not easily be. Explained by chance variations alone (not likely to happen) Statistical inference: process of drawing conclusions about population from the sample. Variable types: quantitative: numbers, interval: differences are meaning full but ratios are not (no starting point, ratio: both differences and ratios are meaning full (has starting point, qualitative: non numbers also called categorical.
