Test Hypotheses About a Population Proportion
-According to a National $2000,3.7 \%$

question 74

Short Answer

Test Hypotheses about a Population Proportion
-According to a national statistics bureau, in $2000,3.7 \%$ of males living in the Southwest were retired exterminators. A researcher believes that the percentage has increased since then. She randomly selects 250 males in the Southwest and finds that 4 of them are retired exterminators. Test this researcher's claim at the $\alpha = 0.1$ level of significance.

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Definitions:

Confederate

A person who is given a role to play in a study so that the social context can be manipulated.

Social Context

The environmental and interpersonal relationships which influence the behaviors, beliefs, and attitudes of individuals.

Internal Validity

The degree to which changes in the dependent variable are due to the manipulation of the independent variable.

Placebo Effect

A phenomenon where patients improve or symptoms are alleviated after receiving a treatment that has no therapeutic effect, attributed to the patient's belief in the treatment's efficacy.