Scientists6, looking for ways to reduce the amount of organic aerosols (OA) in the atmosphere, measured the nighttime rate of production of NO3 and also the rate of production of particular organic nitrates which comprise about 30% of the organic aerosol present. The summary statistics for the production of x = low reactivity NO3 (ppbv / hr) and y = production of particular organic nitrates (ppbv/hr) are

(a) Calculate the correlation coefficient r.
(b) What proportion of the variation in OA is explained by the least squares straight line fit to the amount of low reactivity NO3?

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x = .8523 n = 13 y = .0208 Σ (x- 2 = 1.949 Σ (x-司(y-刃= .02738 Σ (y-y)2-.000930