STA 13 Study Guide - Midterm Guide: Decision-Making, Standard Deviation, Fair Coin
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Science of collecting, analyzing, and interpreting data: descriptive statistics o o. Inferential statistics: use information for a smaller subgroup to make statements and generalizations about a larger group o. Inference: extend the sample findings to the population. Choose randomly, in such a way that every subset of 100 students is equally likely to be chosen simple random sample (srs: no bias. Inference want a sample that looks like the population : representative sample sample that exhibits the same characteristics as the population. Bias systematic (across the board) difference between sample & population (favors some part of the population: selection bias. Some types of units are more likely to be selected than others, proportions will be distorted between sample and population: non-response bias. People don"t reply, respondents have to choice to respond or not introduces bias. Suppose we are interested in the heights of ucd freshmen.
