Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 04 Mar 2018 My Price 6.00

hours of a heating element

The life in hours of a heating element used in a furnace is known to be approximately normally distributed. A random sample of 15 heating elements is selected and found to have an average life of 598.14 hours and a sample standard deviation of 16.93 hours
(a) At the 0.05 level of significance, test the hypotheses H0: µ = 550 versus H1: µ > 550. On completing the hypothesis test, do you believe that the true mean life of a heating element is greater than 550 hours? Clearly state your answer.

(b) Find the P-value of the test statistic.

(c) Construct a 95% lower confidence bound on the mean and describe how this interval can be used to test the alternative hypothesis of part (a).

(d) Construct a two-sided 95% CI for the underlying variance.

Answers

Maurice Tutor
(5)
Status NEW Posted 04 Mar 2018 06:03 PM My Price 6.00

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