SOLUTION: The time to repair an electronic device is a normally distributed random variable measured in hours. It is believed that the true average time to repair such a device is 225 hours
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-> SOLUTION: The time to repair an electronic device is a normally distributed random variable measured in hours. It is believed that the true average time to repair such a device is 225 hours
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Question 862152: The time to repair an electronic device is a normally distributed random variable measured in hours. It is believed that the true average time to repair such a device is 225 hours. Which of the following 95% confidence intervals would lead to rejecting the claim that the average time to repair the devices is 225 hours?
A.
(220.72, 228.16)
B.
(210.86, 236.39)
C.
(236.77, 241.82)
D.
Not enough information given.
You can reject the claim at the 95% confidence level if the hypothesized value is not contained in the 95% confidence interval. One of your choices does NOT contain the value 225.
John
My calculator said it, I believe it, that settles it
