a. Find the null and alternative hypothesis b. What does the random variable X represent? c. State the distribution use for the test. X ~ ____ (_______,______)
A particular brand of tires claims that its deluxe tire averages at least 50,000 miles before it needs to be replaced. From past studies of this tire, the standard deviation is known to be 8,000. A survey of owners of that tire design is conducted. Of the 28 tires surveyed, the mean lifespan was 45,900 miles with a standard deviation of 9,800 miles. Using alpha = 0.05, is the data highly consistent with the claim?
Note: If you are using a Student's t-distribution for the problem, you may assume that the underlying population is
a. Find the null and alternative hypothesis
b. What does the random variable X represent?
c. State the distribution use for the test. X ~ ____ (_______,______)
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