The test statistic for the one- tail sign test, S, is the number of plus signs regardless of the type of alternative hypothesis.

Name: The test statistic for the one- tail sign test, S, is the number of plus signs regardless of the type of alternative hypothesis.
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The test statistic for the one-tail sign test, S, depends on the type of alternative hypothesis (whether it's testing for an increase or a decrease), so it could be the number of plus signs or minus signs, not just the plus signs.

The Test Statistic for the One- Tail Sign Test, S