Types of Samples
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8 Terms
simple random
each member has an equal chance of being selected
systematic
members are selected according to a specified interval
self-selected
members volunteer to be included in the sample
convenience
members that are readily available are selected
stratified
members are selected from similar, nonoverlapping groups
survey
data are collected from responses given by members of a group regarding their characteristics, behaviors, or opinions.
experiment
the sample is divided into two randomly selected groups, the experimental group and the control group. The effect on the experimental group is then compared to the control group.
observational study
members of a sample are measured or observed without being affected by the study.