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JMP Knowledge Base

Incorrect values are given with the Confidence Interval for One Proportion calculator in JMP® software

Created: Nov 30, 2022 02:34 PM | Last Modified: Dec 1, 2022 3:34 PM

In certain conditions, the Confidence Interval for One Proportion calculator, available in the JMP^® Sample Data Index, gives incorrect confidence intervals. These conditions are when the Number of Successes (x) equals the Sample Size (n), and when the Number of Successes equals 0. The alpha level should be divided by 2 in these cases, so, to get the correct calculations, change the Confidence Level value to (1 - alpha/2) rather than (1 - alpha).

[Previously JMP Note 68507]

Details

Operating System

macOS Windows

Reported Version

15.2

Fixed Version

17.1

Products JMP JMP Pro

JMP Knowledge Base

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