**Statistics Examples | Hypothesis Testing - Mathway**
https://www.mathway.com/examples/statistics/hypothesis-testing/determining-if-left-right-or-two-tailed-test-given-the-null-hypothesis?id=1054

The alternative hypothesis or must always express the opposite of the operator used for the null hypothesis . In this case, the opposite of is . Depending on the alternative hypothesis operator , greater than operator will be a right tailed test, less than operator is a left tailed test, and not equal operator is a two tailed test.

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