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OpenStudy (anonymous):
In a study of 235 adults, the mean heart rate was 82 beats per minute. Assume the population of heart rates is known to be approximately normal with a standard deviation of 5 beats per minute. What is the 98% confidence interval for the mean beats per minute? 80.9 – 86.3 70.9 – 83.3 81.2 – 82.8 80.9 – 83.3
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