Question
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
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
= 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)
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College Algebra
Authors: Cynthia Y Young
3rd Edition
1118475690, 9781118475690
