When Psychologists Compare Separate Groups of Three-Year-Olds, Eighteen-Year-Olds, and Forty-Year-Olds

question 93

Multiple Choice

When psychologists compare separate groups of three-year-olds, eighteen-year-olds, and forty-year-olds on a vocabulary test, they are conducting a:

• A) longitudinal study.
• B) kinship study.
• C) clinical study.
• D) cross-sectional study.

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Definitions:

Alternative Hypothesis

A statement that contradicts the null hypothesis and indicates there is an effect or difference.

Critical Value Approach

A method used in hypothesis testing where the value of the test statistic is compared to a critical value to decide whether to reject the null hypothesis.

Hypothesized Population

The theoretical or assumed characteristics of a population from which a sample is drawn for the purpose of hypothesis testing.

Standard Error

A statistical measure that describes the accuracy with which a sample distribution represents a population by quantifying the dispersion of sample means around the population mean.