FOR NEXT 5 QUESTIONS USE THE FOLLOWING DIRECTION: The average life of light bulbs produced by SABA Electric Co. is expected to be normally distributed with the mean service life of 950 hours and standard deviation of 100 hours. A random sample of 100 bulbs is tested and it has a mean life of 910 hours. Can researcher conclude that the mean service life of the bulbs is less than the expectation? H0 is null hypothesis, and Ha is alternative hypothesis.

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Question 7

2.5pts

What significance level () do you suggest for this test?

Level of significance = 100

Level of significance = 0%

Level of significance = 95%

Level of significance = 99%

None of the above

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Question 8

2.5pts

Which one of the following is a correct conclusion based on the given data?

Reject H0. The mean service life of the bulbs is less than the expectation.

Do not reject H0. The mean service life of the bulbs is less than the expectation.

Reject H0. The mean service life of the bulbs is not less than the expectation

Do not reject H0. The mean service life of the bulbs is not less than the expectation

None of the above.