![]() ![]() Again, in principle, there is no limit to the number of pistons that could be produced and measured. Each of these will be somewhat different, reflecting not only errors in our method of measuring but also real variations in the actual diameter. We might also measure the diameter of pistons being produced in an automotive plant. In principle, the number of possible measurements is unlimited. We might guess that the average of these two measurements would be closer to the true (unknown) value, and that the more measurements we make the closer the average will be to the true value. We measure it again and obtain a slightly different result. Imagine that we want to know the distance from the front wall of this room to its back wall. Generated by the Descriptive Statistics tool in Excel’s Data Analysis ![]() Definitions of descriptive statistics of a single variable ![]()
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