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    Finding critical value for z using excel function

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    For each of the following situations, find the critical value for Z.
    a)    H0: P = 0.05 vs. HA: P > 0.05 at α = 0.05.
    b)   H0: P = 0.6 vs. HA: P ≠ 0.6 at α = 0.01.
    c)    H0: P = 0.5 vs. HA: P < 0.5 at α = 0.01; n = 500.
    d)   H0: P = 0.2 vs. HA: P < 0.2 at α = 0.01.

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