(Answered) Validity true story i once spoke to a retired professor who

Statistics

Validity: True story: I once spoke to a retired professor who used to teach general studies geography. His grading technique was to throw the papers/tests on the ground and randomly assign the same grade to each pile (without even reading the papers/tests). If students were not happy with the grade, they could write a little paper justifying why they should receive a higher grade. He assigned grades on the basis of those papers.

What data would this professor have to collect to show that his grading method meets the criteria for each type of validity?

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