Suppose that a customer service center claims that the telephone calls it receives last 112 seconds on average, with a standard
deviation of 9 second. If you took a sample of 324 telephone calls, which of the following mean times would be within the 95% confidence interval
1 answer:
Answer:
95% Confidence interval: (111.02,112.98)
Step-by-step explanation:
Average = 112 seconds
Standard Deviation = 9 seconds
n = 324
Confidence interval:
Putting the values, we get,
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