A company manufactures light bulbs. The company wants the bulbs to have a mean life span of
hours. This average is maintained by periodically testing random samples of
light bulbs. If the t-value falls between
and
then the company will be satisfied that it is manufacturing acceptable light bulbs. For a random sample, the mean life span of the sample is
hours and the standard deviation is
hours. Assume that life spans are approximately normally distributed. Is the company making acceptable light bulbs? Explain.
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