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Determining the average life span

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Reference no: EM132522619

A sample of 25 light bulbs revealed that the average life span was 855 hours with a standard deviation of 130 hours. Assuming a normal distribution for the lifespan of the population of light bulbs, test the claim at a .01 level of significance that the mean life span of the population of light bulbs is less than 865 hours.

a) State the claim

b) State the Null Hypothesis:

c) State the Alternative Hypothesis:

d) Determine the type of test used:

e) Determine the critical value(s) CV

f) Find the Test statistic (TS):

g) Decision and conclusion

Reference no: EM132522619

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