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| The range between measurements helps us with a trick later on (see #8). The "range" is the distance between the two numbers. Use subtraction. | ||||||||||||
| This is one of those tricks you can learn without really needing to know why right away. Just think of it as getting familiar with the amount of change between samples | ||||||||||||
| Practice: What is the range between each measurement? Here are the width measurements from maple leaves. | ||||||||||||
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The range is the difference between each measurement. | ||||||||||||
| The Middle Range is the number at the middle spot in the list of ranges. To find the middle range, you have to line up the ranges in lowest to highest order (sort 'em), count how many ranges there are, and then count to the middle range. | ||||||||||||
Practice: What is the middle range? From the practice above, (finding the ranges between measurements), find the middle range. |
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| Here are the ranges from the first practice on this page, sorted into acsending order. The middle range (also called the "median") is the 5th one (5 is the middle of 9) |
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- Trick 7, Plotting Measurements on a Control Chart