=+1998: 87–93) included a scatterplot of y 5 final settled height fraction versus x 5 initial solids concentration (g/L), from which the following data was read:

x: .5 .9 1.1 1.7 2.0 2.2 2.7 3.0 3.3 4.2 y: .06 .08 .10 .13 .15 .16 .18 .17 .15 .27 x: 4.5 5.3 5.8 5.9 6.2 6.8 7.2 9.1 9.4 10.4 y: .30 .25 .31 .32 .48 .43 .32 .40 .61 .57 Summary quantities include n 5 20,

^xi 5 92.2 ^x 2

i 5 591.46

^yi 5 5.44 ^y 2

i 5 1.9674

^xi yi 5 33.577