The article “Effects of Enhanced UV-B Radiation on Ribulose-1,5-Biphosphate, Carboxylase in Pea and Soybean” (Environmental and Experimental Botany [1984]: 131–143) included the accompanying data on pea plants, with y = sunburn index and x = distance (cm) from an ultraviolet light source.

Estimate the mean change in the sunburn index associated with an increase of 1 cm in distance in a way that includes information about the precision of estimation.

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x .18 .21 .25 3.7 3.0 y 4.0 X y .40 2.1 .26 .30 .32 .36 2.9 2.6 2.5 2.2 .50 .51 .54 .61 .62 .63 1.5 1.5 1.5 1.3 1.2 1.1 2x = 28,037 Ex=609 2 y = 84.45 Ey=33.1 Σxy = 1156.8 .40 2.0