If a test that has reliability r is lengthened by a factor n(n ≥ 1), the reliability R of the new test is given by R(n) = (nr)/(1 + (n − 1)r), 0 < r ≤ 1.If the reliability is r = 0.25, the equation becomes R(n) = 0.25n/(0.75 + 0.25n)

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