Range Rule of Thumb for Interpreting s The 20 brain volumes (cm3) from Data Set 8 “IQ and Brain Size” in Appendix B have a mean of 1126.0 cm3 and a standard deviation of 124.9 cm3 . Use the range rule of thumb to identify the limits separating values that are significantly low or significantly high. For such data, would a brain volume of 1440 cm3 be significantly high?

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Range Rule of Thumb for Interpreting s The 20 brain volumes (cm3) from Data Set 8 “IQ and Brain Size” in Appendix B have a mean of 1126.0 cm3 and a standard deviation of 124.9 cm3 . Use the range rule of thumb to identify the limits separating values that are significantly low or significantly high. For such data, would a brain volume of 1440 cm3 be significantly high?

Aubree Mcintyre · Accepted Answer

Step 1Using the following range as a guide, find the values that are noticeably low or high:Values that are noticeably low are indicated by&amp;nbsp;μ−2σ. The values lower than or equal to this&amp;nbsp;μ−2σ&amp;nbsp;values are regarded as being extremely low.Values that are unusually high are indicated by&amp;nbsp;μ+2σ. The values higher than or equal to this&amp;nbsp;μ+2σ&amp;nbsp;value are considered to be significantly high.Step 2Here, the values that are noticeably low and high are determined as follows:Signinficantly low&amp;nbsp;=1.125−2(124.9)=875.2Signinficantly high&amp;nbsp;=1.125+2(124.9)=1374.8Step 3Consequently, the indicated brain volume value with&amp;nbsp;1,440cm3&amp;nbsp;is significantly high because it is greater than&amp;nbsp;1,374.8cm3.

Range Rule of Thumb for Interpreting s The 20 brain volumes (cm^{3}) from Data Set 8 “IQ and Brain Size” in Appendix B have a mean of 1126.0 cm^{3} an

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