Alangs

19.07.2020 • 

Mathematics

In tests of a computer component, it is found that the mean time between failures is 937 hours. A modification is made which is supposed to increase reliability by increasing the time between failures. Tests on a sample of 36 modified components produce a mean time between failures of 960 hours, with a standard deviation of 52 hours. Is there enough evidence to support the claim that, on average, the modified components last longer than 937 hours between failures? Use a level of significance of 5%. Enter the Null Hypothesis for this test: H0:

Enter the Alternative Hypothesis for this test: H1:

What is the p-value for this hypothesis test? Round your answer to four decimal places.

What is the decision based on the given sample statistics?

Ответ:

TheViperMlg23676

27.09.2020

Mathematics

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n:  {7, 12}

Step-by-step explanation:

(n - 9)^2 = n - 3, or

n² - 18n + 81 = n - 3

Rewriting this into the form of a quadratic, we get:

n² - 19n + 84 = 0, or

(n - 7)(n - 12) = 0

Then n:  {7, 12}

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