# Range Rule of Thumb for Estimating s The 20 brain volumes (cm 3 ) from Data Set 8 “IQ and Brain Size” in Appendix B vary from a low of 963 cm3 to a high of 1439 cm3 . Use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 124.9 cm3

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Range Rule of Thumb for Estimating s The 20 brain volumes (cm 3 ) from Data Set 8 “IQ and Brain Size” in Appendix B vary from a low of 963 cm3 to a high of 1439 cm3 . Use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 124.9 cm3

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Step 1

Given:

True Standard deviation = 124.9 cm3

Lowest value = 963 cm3

Highest value = 1439 cm3

Step 2

Using range rule of thumb, we can find standard deviation:

Step 3

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