A researcher designs an intervention to combat anti-Semitism. He also designs a

Question

A researcher designs an intervention to combat anti-Semitism. He also designs a questionnaire to measure anti-Semitism so he can test the participants' level of anti-Semitism before and after the intervention. He tests one version of his questionnaire with 45 statements and a shorter version with 12 statements. In both questionnaries, 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 long version, and Graph II graphs the results from the short version. Complete the following sentences by trusting your eyes to see meaningful differences in the two graphs. The range for Graph I is ___ the range for Graph II. The mean for Graph I is ___ the mean for Graph II. The variance for Graph I is ___ the variance for Graph II. This implies that the shorter questionnaire will be ___ than the longer questionnaire at detecting differences before and after the intervention.

Explanation / Answer

MORE THAN : the range of graph1 is 4 which is more than range of graph 2. EQUAL TO : the highest point of both the graphs is at same point(=2) MORE THAN : GRAPH 2 IS STEEPER AS COMPARED TO GRAPH1 BETTER: due to less variance

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