A Researcher Wants to Conduct a Before/after Study on 11

question 13

Multiple Choice

A researcher wants to conduct a before/after study on 11 subjects to determine if a new cholesterol medication results in higher HDL cholesterol readings.The null hypothesis is that the average difference is zero while the alternative hypothesis is that the average difference is not zero.Scores are obtained on the subjects both before and after taking the medication.After subtracting the after scores from the before scores, the average difference is computed to be -2.40 with a sample standard deviation of 1.21.Assume that the differences are normally distributed in the population.The degrees of freedom for this test are _______.

• A)11
• B)10
• C)9
• D)20
• E)2

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Definitions:

Negative Connotation

A term or phrase that evokes undesirable, adverse, or unfavorable feelings or associations.

Contingent

Depending on something else that might or might not happen, often used to describe work or benefits that are not guaranteed but based on certain conditions.

Centralize Power

The act of concentrating authority and decision-making capabilities within a small group or at the top level of an organization.

National Culture

The set of shared values, beliefs, customs, practices, and social behaviors that characterize the people of a nation.