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A company that manufactures light bulbs claims that its light bulbs last an average of 1,150 hours.A sample of 25 light bulbs manufactured by this company gave a mean life of 1,097 hours and a standard deviation of 133 hours.A consumer group wants to test the hypothesis that the mean life of light bulbs produced by this company is less than 1,150 hours.The significance level is 5%.Assume the population is normally distributed.
-What is the critical value of t?
A)-1.704
B)-1.711
C)-2.797
D)-2.787

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Quizplus · Accepted Answer

The critical value of t for a one-tailed test with 24 degrees of freedom (n-1 = 25-1) at a 5% significance level is approximately -1.711.

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