Recent studies have suggested that a significant negative correlation exists between

subjects' cerebral glucose metabolic rate (CGMR) ?and their scores on a standardized test of intelligence (IQ). ?That is, ?subjects who metabolize less glucose obtain higher IQ test scores. In an attempt to replicate this negative correlation, a researcher measures the CGMR of 8 ?young adult subjects as they work on an IQ test. The following data were obtained, where CGMRs are expressed as Z scores: (table as seen below)

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