Assigning Properties

For many properties, you can specify more than one value. Click Add Icon

to specify multiple values.

Note: Specify only one value per row.

Properties	Description
Type of Test
Type of t test	performs power and sample size analyses for t tests that involve one sample, paired samples, or two independent samples.
Solve For
requests a solution for power or total sample size.
Analysis Details
Select the assumed distribution of the data	specifies the underlying distribution assumed for the test statistic. By default, the task assumes a normal distribution.
Select the number of sides of the test	specifies the number of sides (or tails) and the direction of the statistical test or confidence interval.
Select a test	specifies whether to perform the Pooled t test or the Satterthwaite t test. Note: This option is available only for a two-sample test.
Significance Level
specifies the alpha values for the test.
Mean
The available options depend on the type of t test: For a one-sample t test, specify the values of the mean and the null mean. For a paired test or a two-sample t test, the available options depend on the distribution type. For a lognormal distribution, you can calculate the mean ratio, the group means, and the null mean ratio. For a normal distribution, you can calculate the difference between the means, the group means, and the difference for the null mean.
Standard Deviation Note: This option is available only if you specify a normal distribution.
specifies the values for standard deviation. For a paired test, you can specify a standard deviation for both groups, or you can specify a standard deviation for each group. For a two-sample t test, the standard deviation is assumed to be the same for both groups.
Coefficient of Variation Note: This option is available only if you specify a lognormal distribution.
The coefficient of variation is defined as the ratio of the standard deviation to the mean on the original data scale. For a paired test, you can specify a coefficient of variation for both groups, or you can specify individual coefficients of variation for each group. For a two-sample t test, the coefficient of variation is assumed to be the same for both groups.
Correlation Note: This option is available only if you select a paired test.
specifies the correlation between members of a pair.
Sample Size
specifies the sample size and whether to allow fractional sample sizes.