STAT 110 Study Guide - Quiz Guide: Statistical Parameter, Statistic, Dependent And Independent Variables
15 Sep 2016
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The key difference between observational study and an experiment is: In observational studies, we observe individuals" responses; in experiments, we deliberately impose a condition to influence the individuals" response. The problem with observational studies is that their findings are often not repeatable. Statistical inference- the process by which sample results are used to make statements about population parameters. Sampling frame: a complete list of every member of the population. Population- all the people we want information about. Response variable- measures an outcome or result of a study. Margin of error- the uncertainty arising from using a sample statistic to estimate a population parameter. A confidence statement includes two things: confidence level, margin of error. Simple random sample: the sample size (or n ) has the same chance of being selected as any other sample of size; unbiased. Statistically significant- meaning that the difference between the treatment groups was so large that it is likely not explained by random chance.
