The following are the monthly figures of advertising expenditure and sales of a firm. It is generally found that advertising expenditure has its impact on sales after 2 months. Allowing for this time lag, calculate coefficient of correlation. Advertising Expenditure ('000) Sales Months Advertising Expenditure ('000) Months Sales July Aug. Sep. Jan. 50 1,200 140 2,400 Feb. 60 1,500 160 2,600 March 70 1,600 170 2,800 April 90 2,000 Oct. 190 2,900 May 120 2,200 Nov. 200 3,100 June 150 2,500 Dec. 250 3,900

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