Fourteen of 180 publicly traded business services companies failed a test for compliance with Sarbanes-Oxley requirements for financial records and fraud protection.
Assuming that these are a random sample of all publicly traded companies, construct a 95 % confidence interval for the overall noncompliance proportion.
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The 95% confidence interval
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to
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Find the p-value for each test statistic.
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Test Statistic
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p-value
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(a) Right-tailed test
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z = +1.34
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(b) Left-tailed test
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z = -2.07
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(c) Two-tailed test
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z = -1.69
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