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OpenStudy (anonymous):
Suppose that a customer service center claims that the telephone calls it receives last 114 seconds on average, with a standard deviation of 9 seconds. If you took a sample of 324 telephone calls, which of the following mean times would be within the 95% confidence interval? A. 114.5 seconds B. 115.5 seconds C. 117.5 seconds D. 116.5 seconds
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OpenStudy (anonymous):
D It seems to be D.
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