A researcher designs an intervention to combat sexism. He also designs a questio

Question

A researcher designs an intervention to combat sexism. He also designs a questionnaire to measure sexism so he can test the participants' level of sexism before and after the intervention. He tests one version of his 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 1 graphs the results from the short version, and Graph II graphs the results from the long 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 will be than the longer at detecting differences before and after the intervention.

Explanation / Answer

The range for graph 1 is less than the range for graph 2

The mean for Graph 1 is equal to the mean for graph 2

The variance for graph 1 is greater than the variance for graph 2

This means that the shorter questionnaire will be more effective than the longer questionnaire in detecting differences before and after the intervention

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