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

sjeikdom0 2021-02-13 Answered
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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Expert Answer

Aubree Mcintyre
Answered 2021-02-14 Author has 73 answers

Step 1
Range rule of thumb for identifying the significantly low or high values:
Significantly low values are identify by μ2σ. The values lower than or equal to this μ2σ value are considered to be significantly low.
Significantly high values are identify by μ+2σ. The values higher than or equal to this μ+2σ value are considered to be significantly high.
Step 2
Here, the significantly low and high values are calculated below:
Signinficantly low =1.1252(124.9)=875.2
Signinficantly high =1.125+2(124.9)=1374.8
Step 3
Thus, the given value of brain volume with 1,440cm3 is significantly high because it is greater than 1,374.8cm3.

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