STAB22H3 Study Guide - Final Guide: Multistage Sampling, Cluster Sampling, Systematic Sampling

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STAB22H3 Full Course Notes
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Extrapolation is when x value is used to predict y value beyond data. But do not try to predict data too far into future. A point is considered high leverage when x value is far from mean of x. A high leverage point is considered influential only if removing it from data will change regression. Remember that x doesn"t always cause y (because there may be a lurking or hidden variable) Make spread more even and less thickened at ends. Any systematic failure of a sampling method to represent population is called bias: Convenience sampling, relying on voluntary response (only those who care), under coverage of pop (too little people), nonresponse bias, response bias (e. g. would you rather sunny cali, or dirty ny?) Randomization is when everyone is given fair random chance of selection. Simple random samples means each set of elements in pop. has an equal chance of selection. Sampling variability refers to samples differing from one another.

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