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Aqualungx
 one year ago
Suppose that a customer service center claims that the telephone call it receives last 112 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. 115.5 seconds
B. 112.5 seconds
C. 114.5 seconds
D. 113.5 seconds
Aqualungx
 one year ago
Suppose that a customer service center claims that the telephone call it receives last 112 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. 115.5 seconds B. 112.5 seconds C. 114.5 seconds D. 113.5 seconds

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ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.2margin of error = 1.96*9/sqrt(324) = 0.98 so the confidence interval is\[\large (1120.98, 112+0.98) = (111.02, 112.98 )\]

ganeshie8
 one year ago
Best ResponseYou've already chosen the best response.2look at the options and pick the one that lies in that interval

aqualungx
 one year ago
Best ResponseYou've already chosen the best response.1so it would be 112.5?
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