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Tukey End Count Test • The Tukey End Count Test is a simple way to determine if the mean has shifted significantly. • To perform this test, arrange the before and after data on a scale so that the data are in order from lowest to highest. • Starting from the left, count the number of data points in the lowest data set until that data point is encountered in the other data set. • From the right, count the number of data points in the highest data set until a data point is encountered in the other data set. • Add the number of data points together and determine α from the chart. Example Arranging both plating data sets from lowest to highest… 4.6 4.7 4.8 4.9 4.9 4.9 5.0 5.0 5.0 5.0 5.0 5.0 5.1 5.1 5.1 5.1 5.1 5.2 5.2 5.2 5.2 5.2 5.2 5.2 5.3 5.3 5.3 5.3 5.3 5.4 4.9 5.0 5.0 5.1 5.1 5.1 5.2 5.2 5.2 5.2 5.3 5.3 5.3 5.3 5.3 5.3 5.4 5.4 5.4 5.4 5.4 5.4 5.4 5.5 5.5 5.5 5.6 5.6 5.7 5.8 3 3 + 7 = 10 end count 7 End Count Significance Confidence there exists a significant shift in the average 6 7 10 13 .10 .05 .01 .001 .90 .95 .99 .999 This compares to the 99+% confidence calculated in the t-test.