Sample Size Calculation, Two Means, t-Test, Independent Samples
Sample Size calculation for two independent samples t-tests with options for charts of sample size vs. standardized effect, sample size vs. alpha level, and sample size vs. power.
General
Element Name | Description |
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Power Goal | Specifies Power Goal for the Sample Size calculation (acceptable range 0.65 to 0.9999). |
Mu1 | Population number one mean. |
Mu2 | Population number two mean. |
Population Standard Deviation | Standard deviation of the population. |
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: Sample Size Calculation produces Sample size Calculation Spreadsheet; Smpl Size Calc plus Charts option produces, in addition, Sample Size vs. Standardized Effect, Sample Size vs. Alpha Level, and Sample Size vs. Power charts. |
Chart Parameters
Element Name | Description |
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Number of Steps. (For charts only) | Number of individual steps for which to calculate Sample Size between the starting and ending parameter values for Sample Size Charts (Min 4, Max 100). |
Starting Power. (For charts only) | Initial power value for calculation of Sample Size vs. Power charts (acceptable range 0.05 to 0.99). |
Ending Power. (For charts only) | Final Power value for calculation of Sample Size vs. Power charts (acceptable range 0.1 to 0.999). |
Starting Standardized Effect. (For charts only) | Initial standardized effect size value for calculation of Sample Size vs. Standardized Effect chart (acceptable range -10 to 9). |
Ending Standardized Effect. (For charts only) | Final standardized effect size value for calculation of Sample Size vs. Standardized Effect chart (acceptable range -9 to 10). |
Starting Alpha. (For charts only) | Initial alpha value for calculation of Sample Size vs. Alpha Level chart (acceptable range 0.0001 to 0.2499). |
Ending Alpha. (For charts only) | Final alpha value for calculation of Sample Size vs. Alpha Level chart (acceptable range 0.0002 to 0.25). |
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