|X Value||Y Value|
The table above provides a random set of data for you to graph on semi-log graph paper. You should try to put a straight line through the data. A best fit line. Don't try to put the line through any particular point but through all the data. The best fit line may not go through any of the points. A clear ruler helps. This allows you can see the points above and below the line to get a good balance. Draw the line. Estimate the intercept on the left and right. Calculate the slope.
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Equation for slope on a Semi-Log Graph