Mathematics, 03.06.2021 22:20 mi364
14. A cellular telephone company recently conducted research into the length of calls (in
minutes) made by customers. In a random sample of 30 calls, the sample mean was
x= 18.6 minutes and the standard deviation was s=5.2 minutes. Construct and interpret
a 90% confidence interval for true mean call length. (4-step process)
Answers: 3
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14. A cellular telephone company recently conducted research into the length of calls (in
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