Question: represents data testing the hypothesis that exposure to the sun can impair IQ. Further imagine that the researcher has recruited groups of people and randomly

represents data testing the hypothesis that exposure to the sun can impair IQ. Further imagine that the researcher has recruited groups of people and randomly assigned them to different levels of exposure to the sun: 0, 1, 6, and 12 hours per day

(enhanced, in all cases, by artificial sunlight when natural light is not available). The mean IQ scores are 142, 125, 88, and 80, respectively.

Redesign this chartjunk graph, either by hand or by using software, paying careful attention to the dos and don’ts outlined in this section.

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