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Figure 7-17. Spreadsheet of results of chess club student survey
Being a big believer in data visualization, the president uploaded the numbers into his com-
puter, Deep Purple. The enlightening bar charts that he saw are shown in Figure 7-18 .
He was about to call up the mayors of Castleborough and Pawnford to congratulate them on
their results when he noticed that the sample sizes were very small relative to the thousands
of students in each city. For some of the grades, as few as 18 students had been surveyed.
He demanded to know what level of confidence he could place on the results, and so he
summoned his chief statistician, who was busy calculating how many chess moves were pos-
sible.
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