Which of the following tools can be converted to a frequency distribution most easily?

The correct answer is D. Check sheet . The CSSBB-aligned quality-tool material states that check sheets are tools for organizing and collecting facts and data , and that a recording check sheet is used to collect measured or counted data . A frequency distribution is simply a tally of how often values or categories occur, so data gathered on a check sheet can be turned into a frequency display very easily.

The related material on histograms shows that histograms are frequency column graphs , and the example explicitly includes frequency tally information. Because a check sheet already gathers data as counts or occurrences, it is the easiest of the listed tools to convert into a frequency distribution or histogram. By contrast, an affinity diagram groups ideas, an interrelationship digraph shows cause linkages, and a PERT chart is for scheduling and network planning. None of those tools is primarily designed to collect count data in a way that naturally converts into frequency form. Therefore, the verified answer is D. Check sheet .