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If a test that has reliability r is lengthened by a factor n (n ?...

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If a test that has reliability r is lengthened by a factor n (n ? 1), the reliability R of the new test is given byIf the reliability is r = 0.6, the equation becomes(b) Find R(2); that is, find R when the test length is doubled.(c) What percent improvement is there in the reliability when the test length is doubled?

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