Question: Refer to Exercise 8.4. Suppose a sample of 600 surgeries with the new scrub shows 18 infections. Find the value of the test statistic, z,

Refer to Exercise 8.4. Suppose a sample of 600 surgeries with the new scrub shows 18 infections. Find the value of the test statistic, z, and explain its meaning in context. The old infection rate was 4%.

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