Mathematics, 20.09.2021 14:00 theoriginalstal9245

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. 117.5 seconds
C. 115.5 seconds
D. 116.5 seconds

Answers: 1

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