A company manufactures light bulbs. The company wants the bulbs to have a mean life span of 999 hours. This average is maintained by periodically testing random samples of 25 light bulbs. If...

A company manufactures light bulbs. The company wants the bulbs to have a mean life span of

999

hours. This average is maintained by periodically testing random samples of

light bulbs. If the t-value falls between

−t0.90

and

t0.90,

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

1006

hours and the standard deviation is

hours. Assume that life spans are approximately normally distributed. Is the company making acceptable light bulbs? Explain.

The company (is/ is not)
making acceptable light bulbs because the t-value for the sample is

and

t0.90=

Jun 08, 2022

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