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Solution 1 of 3 B8 Tables A hospital director is told that 55 % of the emergency room visitors are insured. The director wants to test the claim that the percentage of insured patients is below the expected percentage. A sample of 320 patients found that 160 were insured. Determine the P-value of the test statistic. You can also solve this using technology. The first step in finding the P-value is to calculate the test statistic. Since we have a simple random sample, the conditions for a binomial distribution are met, and np > 5 and n(1 — p) > 5, we can use the normal distribution for the test statistic. The formula for calculating the value of the z-test statistic is: p-rp /p(l -p) n where}; is the sample proportion, p is the hypothesized population proportion, and n is the sample size. ” — L Continued on the next page ...