Independent Sample t-Test: Power Calculation Parameters - Quick Tab

Select the Quick tab of the Independent Sample t-Test: Power Calculation Parameters dialog box to access options to establish the basic parameters for analyzing power for the independent sample t-test.  

Fixed Parameters

The entries in the boxes under Fixed Parameters establish the values for the fixed parameters in the power calculation.

Mu1

Enter the mean for the population from which group 1 was sampled in the Mu1 box.

Mu2

Enter the mean for the population from which group 2 was sampled in the Mu2 box.

N1

Enter the sample size for group 1 in the analysis in the N1 box.

N2

Enter the sample size for group 2 in the analysis in the N2 box.

Alpha

Enter the Type I error rate used in determining the critical value for the t-statistic in the Alpha box.

Sigma

Enter the population standard deviation for the population sampled from in the analysis in the Sigma box.

Type of Hypothesis

Use the option buttons under Type of Hypothesis to determine the type of null hypothesis tested by the t-statistic.

2-tailed (Mu1 = Mu2)

Select the 2-tailed (Mu1 = Mu2) option button to use null and alternative hypotheses of the form

H₀: μ₁ = μ₂ H₁: μ₁ ¹ m₂

1-tailed (Mu1 <= Mu2)

Select the 1-tailed (Mu1 <= Mu2) option button to use null and alternative hypotheses of the form

H₀: μ₁ &le; m₂ H₁: m₁ > m₂

1-tailed (Mu1 >= Mu2)

Select the 1-tailed (Mu1 >= Mu2) option button to use null and alternative hypotheses of the form

H₀: μ₁ ³ m₂ H₁: m₁ < m₂