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Part 1

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

1004

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

25

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

1011

hours and the standard deviation is

26

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

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Part 1

The company

is not

is

making acceptable light bulbs because the t-value for the sample is

t=enter your response here

and

t0.90=enter your response here.

(Round to two decimal places as needed.)