Power Calculation, Two Means, t-Test, Dependent Samples
Power calculation for dependent samples t-tests with option for charts of power vs. sample size (number of sample pairs), power vs. standardized effect size, power vs. an alpha level
General
Element Name | Description |
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Sample Size | The number of observation pairs for the power calculation (Acceptable range 2 to 150000). |
Mu1 | Population number one mean. |
Mu2 | Population number two mean. |
Sigma1 | Population 1 standard deviation. |
Sigma2 | Population 2 standard deviation. |
Rho | Coefficient of correlation between the two populations of measurements (acceptable range -0.9999 to 0.9999). |
Alpha Level | Alpha level (Type I error rate for t-statistic) (acceptable range 0.0001 to 0.25). |
Hypothesis type | Hypothesis type selection: Two-tailed (Mu1=Mu2, population one mean=population two mean); One-tailed (Mu1<=Mu2, population one mean <= population two mean); One-tailed (Mu1>=Mu2, population one mean >= population two mean). |
Detail of computed results reported | Output level of detail selection: Power Calculation produces Power Calculation Spreadsheet; Pwr Calc plus Charts option produces, in addition, Power vs. Sample Size chart, Power vs. Standardized Effect, and Power vs. Alpha Level charts. |
Chart Parameters
Element Name | Description |
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Number of Steps. (For charts only) | Number of individual steps for which to calculate power between the starting and ending parameter values for Power Charts (Min 4, Max 100). |
Starting Sample Size. (For charts only) | Initial sample size for calculation of Power Vs Sample Size chart (acceptable range 2 to 140,000). |
Ending Sample Size. (For charts only) | Final sample size for calculation of Power vs. Sample Size chart (acceptable range 5 to 150,000). |
Starting Standardized Effect. (For charts only) | Initial standardized effect size for calculation of Power vs. Standardized Effect chart (acceptable range -10 to 9). |
Ending Standardized Effect. (For charts only) | Final standardized effect size for calculation of Power vs. Standardized Effect chart (acceptable range -9 to 10). |
Starting Alpha Level. (For charts only) | Initial alpha level for calculation of Power vs. Alpha Level chart (acceptable range 0.0001 to 0.2499). |
Ending Alpha Level. (For charts only) | Final alpha level for calculation of Power vs. Alpha Level chart (acceptable range 0.0002 to 0.25). |
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