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2021-02-13

Range Rule of Thumb for Interpreting s The 20 brain volumes $\left(c{m}^{3}\right)$ from Data Set 8 “IQ and Brain Size” in Appendix B have a mean of and a standard deviation of . 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 be significantly high?

Aubree Mcintyre

Step 1
Using the following range as a guide, find the values that are noticeably low or high:
Values that are noticeably low are indicated by $\mu -2\sigma$. The values lower than or equal to this $\mu -2\sigma$ values are regarded as being extremely low.
Values that are unusually high are indicated by $\mu +2\sigma$. The values higher than or equal to this $\mu +2\sigma$ value are considered to be significantly high.
Step 2
Here, the values that are noticeably low and high are determined as follows:

Step 3
Consequently, the indicated brain volume value with $1,440c{m}^{3}$ is significantly high because it is greater than $1,374.8c{m}^{3}$.

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