Subjects in a Multiple Group Experimental Study Are Tested for How

question 15

Multiple Choice

Subjects in a multiple group experimental study are tested for how much time it takes them to navigate a maze and find the chocolate. The maze is reconstructed after each run, and three different floor plans are used. Each group is tested eight times in 8 hours at a different time of day. The runs later in the day have faster times than the earlier ones. Which threat to internal validity might account for this difference?

• A)Instrumentation
• B)Selection
• C)Testing
• D)Statistical regression toward the mean

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Definitions:

Nominal GDP

The gross domestic product measured at current market prices, not adjusting for inflation, reflecting the value of all goods and services produced.

Real GDP

The total value of all goods and services produced by an economy over a specific time period, adjusted for inflation.

Price Level

The mean of present prices for all goods and services produced within an economy, typically gauged by a price index.

Exchange Rate

the value of one currency for the purpose of conversion to another, showing how much of one currency can be exchanged for a unit of another currency.