The 20 brain volumes (cm3) from Data Set "IQ and Brain Size" in Appendix B vary from a low of 950 cm³ to a high of 1580 cm3. Use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 155 cm3.

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The 20 brain volumes (cm3) from Data Set "IQ and Brain Size" in Appendix B vary from a low of 950 cm³ to a high of 1580 cm3. Use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 155 cm3.

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