Select the Quick tab of the t-Test for Zero Correlation: Sample Size Parameters dialog box to access options to establish the basic parameters for analyzing sample size for the t-test for zero correlation.

Fixed Parameters. The entries in the boxes under Fixed Parameters establish the fixed, or baseline, parameters for subsequent sample size calculations and graphs. Parameters that are not varied explicitly as the dependent (x-axis) variables in a graphical analysis will be set equal to these values.

Rho. In the Rho box, enter the actual value of the population correlation (ρ).

Alpha. In the Alpha box, enter the type I error rate (α) used in determining the critical value for the t-statistic.

Power Goal. In the Power Goal box, enter the minimum acceptable power, for which a minimum sample size is calculated. If the search for an acceptable sample size is successful, the actual power of the statistical test will be greater than or equal to this value.

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 (Rho = 0). Select the 2-tailed (Rho = 0) option button to use null and alternative hypotheses of the form

H0:
r

1-tailed (Rho <= 0). Select the 1-tailed (Rho <= 0) option button to use null and alternative hypotheses of the form

H0:
r

1-tailed (Rho >= 0). Select the 1-tailed (Rho >= 0) option button to use null and alternative hypotheses of the form

H0:
r