Solve the Problem $\sigma$ = 24 Years, Find the Margin of Error in Estimating

question 44

Multiple Choice

Solve the problem.
-A sample of 35 washing machines yields a mean replacement time of 9.0 years. Assuming that $\sigma$ = 2.4 years, find the margin of error in estimating $\mu$ at the 90% level of confidence.

• A)0.7 years
• B)0.5 years
• C)2.5 years
• D)0.1 years

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