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One-tailed hypothesis: average illumination life-span

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A certain brand of fluorescent light tube was advertised as having an average illumination life-span of 2,000 hours. A random sample of 64 bulbs burned out with a mean life-span of 1,970 hours and a sample standard deviation of 80 hours. With a 0.05 level of significance, is the sample mean less than the advertised mean?

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Solution Summary

This problem explains how to do the one-tail hypothesis test in easy steps.

Solution Preview

First, write the hypothesis to be tested. The thing we want to prove is always an alternate hypothesis. Here we want to prove that the population mean is less than 2000 hours.
H0: Mean ...

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