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110 S1 and S2 are the population standard deviations. They represent the variability in the populations. Summary Statements Group sample sizes of 17 and 17 achieve 29% power to detect a difference of 0.001 between the null hypothesis that both group means are 0.040 and the alternative hypothesis that the mean of group 2 is 0.039 with estimated group standard deviations of 0.002 and 0.002 and with a significance level (alpha) of 0.05000 using a two-sided two-sample t-test. Two-Sample Power Analysis Numeric Results for 2-sample t-Test (Normal Distribution) (assuming a difference of 1 mm is Clinically different) With different hypothetical standard deviations Null Hypothesis: Mean1=Mean2. Alternative Hypothesis: Mean1<>Mean2 The standard deviations were assumed to be unknown and unequal. Allocation Power N1 N2 Ratio 0.81477 24 24 1.000 0.81036 38 38 1.000 0.80585 29 29 1.000 0.80436 43 43 1.000 0.80715 54 54 1.000 0.80155 68 68 1.000 Alpha Beta Mean1 Mean2 0.05000 0.18523 1.950 2.950 0.05000 0.18964 1.950 2.950 0.05000 0.19415 1.950 2.950 0.05000 0.19564 1.950 2.950 0.05000 0.19285 1.950 2.950 0.05000 0.19845 1.950 2.950 S1 0.500 0.500 1.000 1.000 2.000 2.000PDF Image | Effect of LED Phototherapy on the Rate of Orthodontic Tooth Movement
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