7. Visualizing variability A researcher designs an intervention to combat anti-S

Question

7. Visualizing variability A researcher designs an intervention to combat anti-Semitism. She also designs a questionnaire to measure anti-Semitism so she can test the participants' level of anti-Semitism before and after the intervention. She tests one version of her questionnaire with 45 statements and a shorter version with 12 statements. In both questionnaires, the participants respond to each statement with a rating on a 5-point Likert scale with 0 equaling "strongly disagree" and 4 equaling "strongly agree." The overall score for each participant is the mean of his or her ratings for the different statements on the questionnaire. Look at the following graphs. Graph I graphs the results from the short version, and Graph II graphs the results from the long version Graph I Graph II PARTICIPANTS PARTICIPANTS SHORT QUESTIONNAIRE SCORE LONG QUESTIONNAIRE SCORE

Explanation / Answer

1.

SMALLER [ANSWER]

As we can see, graph 1 only ranges from 0.75 to 3.25, while the second from 0.25 to 3.75.

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2.

They are both centered at = 2, so

THE SAME AS, EQUAL TO [ANSWER]

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3.

Graph 1 is thinner, so it has less variance.

LESS THAN [ANSWER]

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4.

As graph 1 has less variance, hthen it is more sensitive to change,

BETTER [ANSWER]

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