The supervisor of a production line believes that the average time to assemble an electronic component is 14 minutes.
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The supervisor of a production line believes that the average time to assemble an electronic component is 14

minutes. Assume that the assembly time is normally distributed with standard deviation of 3.4 minutes. For a sample of 40 components, she finds that the mean assembly time was 13 minutes. Test the null hypothesis that the average time is 14 minutes against the alternative that it is different from 14 minutes. Which of the following statements is most accurate?

a. Unable to reject the null hypothesis at ≤ 0.10.                     b. Reject the null hypothesis at = 0.10.

c. Reject the null hypothesis at = 0.05.                                       d. Reject the null hypothesis at = 0.01.

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