<Li> Create one final column d i 2 (\ displaystyle d_ (i) ^ (2)) to hold the value of column d i (\ displaystyle d_ (i)) squared . </Li> <Table> <Tr> <Th> IQ, X i (\ displaystyle X_ (i)) </Th> <Th> Hours of TV per week, Y i (\ displaystyle Y_ (i)) </Th> <Th> rank x i (\ displaystyle x_ (i)) </Th> <Th> rank y i (\ displaystyle y_ (i)) </Th> <Th> d i (\ displaystyle d_ (i)) </Th> <Th> d i 2 (\ displaystyle d_ (i) ^ (2)) </Th> </Tr> <Tr> <Td> 86 </Td> <Td> 0 </Td> <Td> </Td> <Td> </Td> <Td> 0 </Td> <Td> 0 </Td> </Tr> <Tr> <Td> 97 </Td> <Td> 20 </Td> <Td> </Td> <Td> 6 </Td> <Td> − 4 </Td> <Td> 16 </Td> </Tr> <Tr> <Td> 99 </Td> <Td> 28 </Td> <Td> </Td> <Td> 8 </Td> <Td> − 5 </Td> <Td> 25 </Td> </Tr> <Tr> <Td> 100 </Td> <Td> 27 </Td> <Td> </Td> <Td> 7 </Td> <Td> − 3 </Td> <Td> 9 </Td> </Tr> <Tr> <Td> 101 </Td> <Td> 50 </Td> <Td> 5 </Td> <Td> 10 </Td> <Td> − 5 </Td> <Td> 25 </Td> </Tr> <Tr> <Td> 103 </Td> <Td> 29 </Td> <Td> 6 </Td> <Td> 9 </Td> <Td> − 3 </Td> <Td> 9 </Td> </Tr> <Tr> <Td> 106 </Td> <Td> 7 </Td> <Td> 7 </Td> <Td> </Td> <Td> </Td> <Td> 16 </Td> </Tr> <Tr> <Td> 110 </Td> <Td> 17 </Td> <Td> 8 </Td> <Td> 5 </Td> <Td> </Td> <Td> 9 </Td> </Tr> <Tr> <Td> 112 </Td> <Td> 6 </Td> <Td> 9 </Td> <Td> </Td> <Td> 7 </Td> <Td> 49 </Td> </Tr> <Tr> <Td> 113 </Td> <Td> 12 </Td> <Td> 10 </Td> <Td> </Td> <Td> 6 </Td> <Td> 36 </Td> </Tr> </Table> <Tr> <Th> IQ, X i (\ displaystyle X_ (i)) </Th> <Th> Hours of TV per week, Y i (\ displaystyle Y_ (i)) </Th> <Th> rank x i (\ displaystyle x_ (i)) </Th> <Th> rank y i (\ displaystyle y_ (i)) </Th> <Th> d i (\ displaystyle d_ (i)) </Th> <Th> d i 2 (\ displaystyle d_ (i) ^ (2)) </Th> </Tr> <Tr> <Td> 86 </Td> <Td> 0 </Td> <Td> </Td> <Td> </Td> <Td> 0 </Td> <Td> 0 </Td> </Tr>

Discuss the difference between r and rho ρ