AP Psych A - Module 6

Which of the following is an example of negative correlation?

• People who spend more time exercising tend to weigh less.

• Teenage females tend to have fewer speeding tickets than teenage males.

• Students with low IQ scores tend to have lower grades.

• As hours studying for a test decrease, so do grades on that test.

• Students’ shoe sizes are not related to their grades.

Which of the following is used only in correlation studies?

• Double blind

• Placebo

• Random assignment

• Scatterplot

• Random sample

Researchers have discovered that individuals with lower income levels report having fewer hours of total sleep. Therefore,

• income and sleep levels are positively correlated.

• income and sleep levels are negatively correlated.

• income and sleep levels are inversely correlated.

• income and sleep levels are not correlated.

• lower income levels cause individuals to have fewer hours of sleep.

Which of the following correlation coefficients represents the strongest relationship between two variables?

• +.30

• +.75

• +1.3

• −.85

• −1.2

The purpose of random assignment is to

• allow participants in both the experimental and control groups to be exposed to the independent variable.

• ensure that every member of the population had an equal chance of being selected to participate in the research.

• eliminate the placebo effect.

• reduce potential confounding variables.

• generate operational definitions for the independent and dependent variables.