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Tolerance Interval Options Dialog Box



The tolerance interval options set by this dialog box are used to modify the options used by the current Test Distribution window.  They are initially set to the values in the Analysis Options dialog box.  Changing these options will only effect the current Test Distribution window.  The following options can be set:  

Confidence Level Combo Box:  Confidence level as a percentage to use for constructing tolerance intervals and confidence statements.  Must be a real number greater than equal to 50.0 but below 100.0.  Recommend 95.0.  Also affects the confidence statement associated with spec limits.

Percentage in Interval Combo Box:  For tolerance intervals, percentage of values in the interval.  Must be a real number greater than 0.0 but below 100.0.  Initially set to 99.0.

Type of Tolerance Interval Radio Group:  For tolerance intervals, can select whether to display an upper, lower or two sided tolerance interval.  A fourth option is provided to use the type of tolerance interval matching the type of specifications.  A two sided tolerance is used for two sided specification and so on.  If no specs are provided, a two sided tolerance interval is displayed.

Units to Use Radio Group:  Can select whether to report tolerance intervals and confidence statements in terms of the percent in spec, percent out of spec or the reliability.

Display Tolerance Intervals Only If Distribution Fits Check Box:  The tolerance intervals and confidence statements are only valid if the distribution used adequately fits the data.  Checking this box will only display them when the test for distribution fit passes.  It is recommended this box be checked.  Also affects the confidence statement associated with spec limits.

When done, click the OK button.  If any errors are found, an error message will be displayed and the errors must be corrected before the dialog box can be closed.  To exit without updating the options, click the Cancel button or press the Esc key.

This dialog box is displayed by clicking the Menu button on the Test Distribution window and selecting the Tolerance Interval Options menu item.