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A random sample of 100 deaths recorded in the United States last year shows an average life span of 71.8 years. Assume a population standard
A random sample of 100 deaths recorded in the United States last year shows an average life span of 71.8 years. Assume a population standard deviation of 8.9 years. We want to test with 95% confidence if the half-life today is less than 68 years based on that sample. Which of the following reflects the hypotheses to be tested and the value of the test statistic to be calculated?
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