An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 750 hours and a standard deviation of 40 hours. Test the hypothesis that u= 750 hours against the alternative, p#750 hours, if a random sample of 30 bulbs has an average life of 742 hours. Use a P-value in your answer. Click here to view page 1 of the standard normal distribution table Click here to view page 2 of the standard normal distribution table. Find the test statistic. (Round to two decimal places as needed.)

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An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of

750

hours and a standard deviation of

40

hours. Test the hypothesis that

μ=750

hours against the​ alternative,

μ≠750

​hours, if a random sample of

30

bulbs has an average life of

742

hours. Use a​ P-value in your answer.

An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 750 hours and a standard deviation of 40 hours.
Test the hypothesis that u = 750 hours against the alternative, µ# 750 hours, if a random sample of 30 bulbs has an average life of 742 hours. Use a P-value in your
answer.
Click here to view page 1 of the standard normal distribution table.
Click here to view page 2 of the standard normal distribution table.
Find the test statistic.
|(Round to two decimal places as needed.)
Transcribed Image Text:An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 750 hours and a standard deviation of 40 hours. Test the hypothesis that u = 750 hours against the alternative, µ# 750 hours, if a random sample of 30 bulbs has an average life of 742 hours. Use a P-value in your answer. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Find the test statistic. |(Round to two decimal places as needed.)
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