STAT150 Study Guide - Final Guide: Interval Estimation, Observational Study, Null Hypothesis
2 Aug 2018
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Document Summary
Primary objective: a representative sample is used to answer questions about a target population. A representative sample should be unbiased and large enough to give accurate information about the population. To ensure that a sample is representative, a random sample (each member of the target population has an equal chance of being chosen) needs to be obtained. For example, obtain a list of the names of each member from the target population and put all the names into a barrel. Select from the barrel without looking at the names. Types of studies: observational study: there is no intervention by the investigator nor is there any treatment imposed, experimental study: investigator has some control over the determinant. There are different types of variables which can be measured on subjects and classified. Data classification: numerical: an observation can take any integer or non-integer value. Continuous: variables that can assume any value: categorical: each observation can fall into a number of groups.
