Seeing Stability in a Stable-Baseline Design Can Help Rule Out

question 14

Multiple Choice

Seeing stability in a stable-baseline design can help rule out which of the following threats to internal validity?

• A)Regression to the mean
• B)Placebo effects
• C)Attrition
• D)Observer bias

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Multiplier

A factor by which an economic variable is multiplied to estimate its impact on other variables.

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Social Security Credit

Based on total wages and self-employment income during the year; the amount of earnings it takes to earn a credit changes each year; in 2009, a person had to earn $1,090 in covered earnings to get one credit; people born after 1929 need 40 credits in their lifetime to qualify for Social Security benefits.

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