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?
Data Set 8

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SEX (1-M) ORDER 1913.88 1684.89 1902.36 1860.24 2264.25 6.08 54.7 57.607 58.968 64.184 58.514 63.958 54.2 5.80 101 1281 7.99 57.8