A study was made by a merchant to determine the relation between advertising expenditures and sales. Table 1 shows the recorded data. Table: 1 Lists the Advertising expenditure (thousand dollars) and Sales (million dollars) 290 Advertising expenditure (x) Sales (y) 250 215 8 330 370 410 8 9 10 (i) Construct the scatter diagram between sales and advertising expenditures. (ii) Compute the correlation coefficient between sales and advertising expenditures. (iii) Interpret the correlation coefficient between sales and advertising expenditures. (iv) Compute the coefficient of determination between sales and advertising expenditures. (v) Interpret, in context, the coefficient of determination.

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.