Although we could use the means of the two variables for the b and d constants, the

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Although we could use the means of the two variables for the b and d constants, the plot is drawn such that we can see the intercept and need to use only

d. By drawing a line along a ruler with the edge passing through the points as a rough eye fit, we see that it passes through a value around 5 on the y-axis. Because the functional form of a straight line f(x) can be taken as just x, either a or c may be used; let us, for example, use a.

a is the amount of change in y per unit increase in x and is negative, because the line decreases from left to right. The line drawn with the ruler shows a drop of about 1 second per 200-cm increase in distance, or a is approximately 0.005. Thus, the roughly fitted equation is: seconds = 5 -

0.005 • centimeters.

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Statistics In Medicine

ISBN: 9780120887705

2nd Edition

Authors: Robert H. Riffenburgh

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