1. The demand and price of a product is given in the following table: Price (Tk.) Demand (kg) 23 35 40 45 44 50 55 72 12.5 8.6 9.4 7.5 4.5 4 2 a. Find the relationship between demand and price using a scatter diagram and comment (interpret). b. Find correlation coefficient and comment. c. Fit a least square regression equation (line) of demand on price and comment. d. What will be the demand when the price is Tk. 38 and Tk. 15? e. Find coefficient of determination (how well the regression line is fitted).

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Matrices

‘Matrices’ is the plural form of the word matrix, and it is basically a spreadsheet in the form of a box. In mathematics, various functions can be carried out with matrices. Generally, a matrix comes in the shape of a square or rectangle. The elements are distributed horizontally in the form of rows, and vertically in the form of columns.