Samples of a drug product are stored in their original containers under normal conditions and sampled periodically to analyse the content of the medication. The following results are obtained. time months x 6 12 18 24 36 48 assay (mg) y 987 967 941 920 896 870 (i) Assuming a linear relationship exists between the two variables find the regression equation of the assay (y) on time (x). (ii) Use the regression line to estimate the amount of drug present, in mg, after 20 months.

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To find the regression equation of the assay y on time x we first need to calculate the slope m and ... View the full answer