If We Are Testing the Hypothesis About the Mean of a Population

question 18

Multiple Choice

If we are testing the hypothesis about the mean of a population of paired differences with samples of n₁ = 10, n₂ = 10, the degrees of freedom for the t statistic is ________.

• A) 19
• B) 18
• C) 9
• D) 8
• E) 10

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Definitions:

Independent Variables

The variables in an experiment that are manipulated or changed by the researcher to observe their effect on the dependent variable.

Dependent Variables

Dependent variables are the variables in an experiment or study that are being tested and measured, often to observe the effects of manipulating independent variables.

Childhood Obesity

A medical condition affecting children and adolescents, characterized by a body mass index (BMI) at or above the 95th percentile for children of the same age and sex.

Correlational Methods

Research methods that examine how variables are naturally related in the real world. The researcher makes no attempt to alter the variables or assign causation between them.