The following estimated regression equation relating sales to inventory investment and advertising expenditures was given. ý = 21 + 13x₁ + 9x₂ The data used to develop the model came from a survey of 10 stores; for those data, SST = 16,000 and SSR = 11,680. (a) For the estimated regression equation given, compute R R². R² 2 (b) Compute R (Round your answer to two decimal places.) a 2

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