SOLUTION: To test the null hypothesis that the average lifetime for a particular brand of bulb is 775 hours versus the alternative that the average lifetime is different from 775 hours, a sa
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Question 247397: To test the null hypothesis that the average lifetime for a particular brand of bulb is 775 hours versus the alternative that the average lifetime is different from 775 hours, a sample of 120 bulbs is used. If the standard deviation is 65 hours and α is equal to 0.01, what values for will result in rejection of the null hypothesis (Please show all work, thank you.)
You can put this solution on YOUR website! To test the null hypothesis that the average lifetime for a particular brand of bulb is 775 hours versus the alternative that the average lifetime is different from 775 hours, a sample of 120 bulbs is used. If the standard deviation is 65 hours and α is equal to 0.01, what values for the test statistic will result in rejection of the null hypothesis (Please show all work, thank you.)
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Find the critical values of t for a 2-tail test with alpha = 1%
and df = 119:
t = -2.6178 or t = 2.6178
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Any test statistics below t = -2.6178.. or above t = 2.6178..
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Cheers,
Stan H.
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