Question

A trucking firm is suspicious of the claim that the average life time of certain tires is at
least 28,000 miles. To check the claim, the firm puts 40 of these tires on its trucks and gets
a mean life time of 27,462 miles with a standard deviation of 1,348 miles. Let the level of
significance be equal to 0.01. Then,
a) State the null hypothesis to be tested.
b) State the alternative hypothesis.
c) Conduct a statistical test of the null hypothesis and state your conclusion

Answer 1

Answer:

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