The following data are from Mattison et al. (2012), who carried out an experiment with rhesus monkeys to test whether a reduction in food intake extends life span (as measured in years). The data are the life spans of 19 male and 15 female monkeys who were randomly assigned a normal nutritious diet or a similar diet reduced in amount by 30%. All monkeys were adults at the start of the study.

a. Graph the results, using the most appropriate method and following the four principles of good graph design.

b. According to your graph, which difference in life span is greater: that between the sexes or that between diet groups?

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Females reduced: 16.5,16.5, 18.9,18.9, 22.6.22.6, 27.8,27.8, 30.2,30.2, 30.7,30.7, 35.935.9 Females control: 23.7,23.7, 24.5,24.5, 24.7,24.7, 26.1.26.1, 28.1.28.1, 33.4,33.4, 33.7,33.7, 35.235.2 Males reduced: 23.7.23.7, 28.1,28.1, 29.8,29.8, 31.1,31.1, 36.3,36.3, 37.7,37.7, 39.9,39.9, 39.9,39.9, 40.2,40.2, 40.240.2 Males control: 24.9.24.9, 25.2.25.2, 29.6.29.6, 33.2,33.2, 34.1,34.1, 35.4.35.4, 38.1,38.1, 38.8.38.8, 40.740.7