17.9.8.1 The (PSS) Two-Variance Test Dialog Box

1 Supporting Information
2 Results Log Output
3 Calculate
4 Test Specification
5 Options
6 Power Curve
7 Output Results

Supporting Information

Results Log Output

Select the box to output results to Results Log (in addition to that specified in Output Results).

Calculate

Power	Compute power for specified sample size.
Sample Size	Compute sample size for proposed power.

Test Specification

1st Group Variance	Value of the 1st population variance.
2nd Group Variance	Value of the 2nd population variance.
Alpha	Probability of rejecting the null hypothesis when it is true.
Hypothetical Power(s)	Specify space-separated list of hypothetical power(s). Available when Calculate = Sample Size.
Hypothetical Sample Size(s)	Specify space-separated list of hypothetical sample size(s). Available when Calculate = Power.
Alternative Hypothesis	Perform a one- or two-tailed test: Not Equal Indicates that the two-tail Variance test is used Less Than Indicates that the lower-tail Variance test is used Greater Than Indicates that the upper-tail Variance test is used

Options

Controls to be used when supplying additional power or sample size values by worksheet dataset:

When calculating power (Calculate = Power):

More Hypothetical Sample Size(s)	Select to activate the Hypothetical Sample Size(s) Column input controls.
Hypothetical Sample Size(s) Column	Specify column of sample size values. Available when More Hypothetical Sample Size(s)... is selected.

When calculating sample size (Calculate = Sample Size):

More Hypothetical Power(s)	Select to activate the Hypothetical Power(s) Column input controls.
Hypothetical Power(s) Column	Specify column of power values. Available when More Hypothetical Power(s)... is selected.

Power Curve

Select to output power curves. The power curve plots every combination of power v.s. the Alternative Proportion. Power curves are helpful for determining the appropriate sample size or power for the test.