Four replicate measurements done for the concentration of nitrate in drinking water yielded the following results: Nitrate content, mg L! 51.0 51.3 51.6 50.9 A. Calculate the mean and standard deviation of the replicate measurements. B. The statutory limit for nitrate concentration according to European Union regulations is 50 mg L'. Has the regulated value been observed? (Note: Another way of asking the same question is: Is there a significant difference between the mean of the measurements and the stated limit?)

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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.