what is the sampling interval how to test for the significance of a change in sampling interval how test for the significance of an increase in an interval how to test if an increase in an interval is significant? what is the significance of increasing test range how to determine the significance of an increase in a standard interval? how do you test the significance of the increase in a sample interval? why is normal distributed a variable how to test the significance of increase in sample interval range how to test the significance of an increase in the sample interval how to test for significance of an increase in the sample interval? how to find significance of an increase in a sample interval how to test for a range of value in a test how to test the significance of an increase in the sample interval ranges? how to test significance of increase in sample interval what is normal range what is the significance of an increase in the sample interval what is the sample interval range what is the normal distribution of the sample intervals how to test for a significant change in the sample interval