Recall that data for six drug tablets were used to fit the simple linear model, E(y) = β0 + β1x, where y = drug release rate and x = surface-area-to-volume ratio. An Excel/XLSTAT printout giving a 90% prediction interval for each of the n = 6 observations in the sample is shown below. Select an observation and give a practical interpretation for this prediction interval.

For Information: Refer to the Drug Development and Industrial Pharmacy (Vol. 28, 2002) drug controlled-release rate study, Exercise 11.17.

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Predictions for the new observations Observation 1.5 1.05 0.9 0.75 0.6 0.65 Pred(RelRate) Lower bound 90% Mean) Upper bound 90% (Mean) 64.91 46 85 41.29 36.12 31.25 32.85 Lower bound S0% Observation) 5.33 40.21 4.90 29.42 23.80 Upper bound-0% 51 08 44.92 9.53 34.15 28.76 30.55 57.26 2.99 37.78 32.17 26.27 28.26 Observator 66.83 49.63 44.17 38.87 33.72 35.42