Q#4: Gilby classified 1725 school children according to intelligence and apparent family economic level. A condensed classification follows: Intelligent 322 Very Capable 233 Classes Very well clothed Well clothed Poorly clothed Dull 81 141 457 163 153 48 127 Test the null hypothesis of independence of the two classifications at 0.05level of significance. (let critical value is 5.99)

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Equations and inequalities describe the relationship between two mathematical expressions.

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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.