Max's Study Compared the Differences in Teachers' Attitudes About Inclusion

question 25

Multiple Choice

Max's study compared the differences in teachers' attitudes about inclusion before and after a Saturday in-service training. He assessed their post-intervention attitudes with a self-report questionnaire. With which of the following threats to validity should Max be particularly concerned?

• A) Instrumentation
• B) Mortality
• C) Selection
• D) History

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Definitions:

Law of Diminishing Marginal Utility

An economic principle stating that as consumption of a good or service increases, the marginal utility derived from each additional unit decreases.

Marginal Utility

Marginal Utility is the added satisfaction or benefit a consumer receives from consuming one more unit of a good or service.

Diminishing Marginal Utility

The principle that the utility or satisfaction gained by consuming each additional unit of a good or service decreases as more of that good or service is consumed.

Marginal Utility

The extra pleasure or benefit derived from consuming an additional unit of a product or service.