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A surgical clamp manufacturer claims that only 10% of its parts are defective (p = 0.10)....

A surgical clamp manufacturer claims that only 10% of its parts are defective (p = 0.10). Hospital critics claim the defect rate is higher (p > 0.10). Testing of 500 randomly selected parts yields a Z statistic of -4.0.

a & b) Write out the null and alternative hypotheses

c) Will the computation result in a one- or two-tailed test (on a Bell curve)?

d) What does the negative z-score indicate regarding the critical region of the test (on a Bell curve)?

e) Will we reject (accept the alternative hypothesis) or fail to reject (accept) the null hypothesis?

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