Question

(CO 5) A light bulb manufacturer guarantees that the mean life of a certain type of light bulb is at least 720 hours. A random sample of 51 light bulbs as a mean of 712.8 hours with a population standard deviation of 62 hours. At an α=0.05, can you support the company’s claim using the test statistic?

Claim is the null, reject the null and cannot support claim as test statistic (-0.83) is in the rejection region defined by the critical value (-1.645)

Claim is the null, fail to reject the null and support claim as test statistic (-0.83) is not in the rejection region defined by the critical value (-1.645)

Claim is the alternative, reject the null and support claim as test statistic (-0.83) is not in the rejection region defined by the critical value (-1.96)

Claim is the alternative, fail to reject the null and cannot support claim as the test statistic (-0.83) is in the rejection region defined by the critical value (-1.96)

Answer #1

A light bulb manufacturer guarantees that the mean life of a
certain type of light bulb is at least 720 hours. A random sample
of 51 light bulbs as a mean of 712.8 hours with a population
standard deviation of 62 hours. At an α=0.05, can you support the
company’s claim using the test statistic? @See text pages
368-370
A. Claim is the null, fail to reject the null and support claim
as test statistic (-0.83) is not in the...

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1.
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Fill in the requested information below.
A. The...

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995 590 910 539
916 728 664 693
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is from a population with a mean life of 900 hours.
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Homework Help:
6VE. Second sample hypothesis testing from word problem to
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A. Yes, since the test statistic is not in the rejection region
defined by the critical value, the...

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