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vrw28
08.04.2020 •
Mathematics
The age (in years) of cars currently on the road in the U.S. is normally distributed. A researcher from the firm IHS Automotive selected a random sample of 30 cars and calculated the interval [10.39, 12.61] as the 90% confidence interval for the average age. The margin of error is .
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Ответ:
Tthe margin of error is 1.11.
Step-by-step explanation:
We know that the confidence interval is given by :-
[Sample mean - Margin of error , Sample mean +Margin of error]
A researcher from the firm IHS Automotive selected a random sample of 30 cars and calculated the interval [10.39, 12.61] as the 90% confidence interval for the average age.
i.e. Sample mean - Margin of error= 10.39 ...(i)
Sample mean + Margin of error = 12.61 ...(ii)
Eliminate (i) from (ii), we get
2(Margin of error)=2.22
⇒Margin of error=1.11
Hence, the margin of error is 1.11.
Ответ: