Independent Sample t-Test: Interval Estimation - Quick Tab

Noncentrality Interval Estimation and the Evaluation of Statistical Models

Select the Quick tab of the Independent Sample t-Test: Interval Estimation dialog box to access options to implement the methods for confidence interval estimation on the standardized effect size Es , defined as

Es = (μ1 - μ2)/σ

Observed t. Enter the observed value of the Independent Sample t-statistic in the Observed t box.

Conf. Level. Enter the confidence level for the confidence interval calculation in the Conf. Level box. Note that confidence limits are presented for two quantities:

Delta. The upper and lower limits are for a confidence interval on Delta, the noncentrality parameter of the noncentral t distribution.

Standardized Effect. These upper and lower limits are for Es.

Sample Size (N1). In the Sample Size (N1) box, enter the sample size for group 1 used in the study.

Sample Size (N2). In the Sample Size (N2) box, enter the sample size for group 2 used in the study.