Measure the heights of the people in your class. Make a stem and leaf plot to help you both order and display the data. Then create a frequency table, a histogram, and a boxplot to display your results (for the boxplot you will need to specify the rules you use in its construction; in particular, what rule determines the length of the whiskers?). Calculate the mean and standard deviation (you will have already calculated the median and interquartile range as a preliminary to drawing the boxplot). Note that some or all of the work can be done by a statistical program on a computer (although the pds program, written to accompany this book, does not do diagrams). However, hand calculations to enhance understanding and to verify the accuracy of the computer program are worthwhile initially. Computer calculations may be affected by programming error. Furthermore, the computer may not always do the calculation that you expect it to do, for various reasons: The data may not be in the format the program expects, you may press the wrong button, or the computer may be programmed to base its calculations on slightly different definitions from the ones taught here (which is likely in the case of interquartile range). POLI967