b. A population is labeled finite if the measurements—individuals, events, etc.—can be counted. In contrast, an infinite population cannot be counted.
c. Descriptive statistics is a procedure of organizing sample data. This procedure allows ...
... middle of paper ...
...ing levels during study periods will affect students test performance.
c. Life expectancy is related to pet ownership.
5. An extraneous variable is a type of variable that can lower an internal validity in a correlational study. Extraneous variables are factors—that are not being studied and are undesirable--that influence the variables and thus outcome of the environment. Some common extraneous variables in psychology, biology, medicine, and neuroscience experiments may be cheating, lying or with holding information, pre-knowledge on a topic, etc.
6. A “within-subjects design” is when the researchers use the same group of subjects in more than one group or treatment. In contrast, a “between-subjects design” researcher does not use the same subjects in more than one group. Instead, the researchers have two or more groups of subjects being tested simultaneously.
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