Using an α =

question 65

Multiple Choice

Using an α = .04, a confidence interval for a population proportion is determined to be .65 to .75. For the same data, if α is decreased, the confidence interval for the population proportion

• A) becomes narrower.
• B) becomes wider.
• C) uses a zero margin of error.
• D) remains the same.

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Definitions:

Solomon Four-Group

An experimental design involving four groups to measure the effects of a treatment while controlling for pretesting.

Pretest

An initial test or assessment conducted before the main test or experiment to evaluate participants' baseline abilities, knowledge, or attitudes.

Pretest-Posttest

A research design that measures the effect of an intervention by comparing conditions before and after the intervention is applied.

Posttest-Only

A research design where measures are taken only after the experimental manipulation, without a pretest comparison.