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Chapter 1: Overview and Descriptive Statistics72. A table of summary statistics, a stem and leaf display, and a comparative boxplot are below.The healthy individuals have higher receptor binding measure on average than the individualswith PTSD. There is also more variation in the healthy individuals’ values. The distributionof values for the healthy is reasonably symmetric, while the distribution for the PTSDindividuals is negatively skewed. The box plot indicates that there are no outliers, andconfirms the above comments regarding symmetry and skewness.PTSD HealthyMean 32.92 52.23Median 37 51Std Dev 9.93 14.86Min 10 23Max 46 721 0 stem = tens3 2 058 leaf = ones9 3 15788997310 4 2681 59763 62 7PTSDIndividualsHealthy10 20 30 40 50 60 70Receptor Binding38

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