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When a new test has strong agreement against a well-established already valid test.

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The researcher was open to bias, as they knew they expected to find greater happiness levels in group A, the group performing team sports.

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They could use a double blind trial in which neither the researcher or participant knows which group they are in. This then removes any bias as the researcher can not look for what they expect to find.

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Mann Whitney Test
Independent groups design
Test of difference between the conditions
Unrelated
Ordinal data