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# Answers to Asgn 1 - distributions of number of trees in the...

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Answers to Assignment 1 1.36. Formulate: Use JMP to construct a histogram. Describe the shape, center and spread with an appropriate numerical summary. Use the 1.5 * IQR rule of thumb to determine whether there are any outliers. Solve: Conclusion: The distribution of survival times is skewed to longer times. The median survival time for the guinea pigs is 102.5 days and the IQR is 71.5 days. There are several values that are far from the center of the distribution. The 1.5*IQR rule of thumb identifies the 6 largest values, from 329 to 598 days, as outliers.

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1.60. State: Has logging had an effect on tree density in Borneo? Formulate: Construct side-by-side boxplots of the three groups of plots and compare the
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Unformatted text preview: distributions of number of trees in the groups. Solve: The modeling type of the column ‘group’ must be changed to ‘Nominal’. Then, we use the ‘Fit Y by X’ analysis platform. Conclude: The interquartile ranges of the three are not that different, i.e. the variability among plots within the three groups is similar. The medians tree counts of the groups differ with the plots that had never been logged (group 1) having more trees than the either of the groups of logged plots. The plots that had been logged 8 years ago (group 3) had more trees than those that had been logged 1 year earlier (group 2)....
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