This table shows the relationship between the price (y pence) of 100g of chocolate and the percentage (x%) of cocoa solids in the chocolate. x (% сосоа) 10 у (pence) 35 Chocolate Brand A 20 55 30 40 35 100 E 40 60 F 50 90 G 60 110 H 70 130 a. Use excel to draw a scatter diagram to represent this data. b. Use excel to calculate the regression line of y on x. c. Use excel to calculate the R?. d. Interpret the meaning of R?. e. One brand of chocolate is overpriced, Suggest, with a reason, which brand is overpriced. f. Use the regression line to suggest a fair price for this brand. g. Comment on the validity of this method for suggesting a fair price.

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