Question

ou measure the lifetime of a random sample of 64 tires of a certain brand. The

sample mean is x bar=50 months and sample standard deviation s=5months . A 99% confidence interval for true mean life time of this brand of tires is:

a) 50 plus minus 2.66x 5/squareroot 63

b) 50 plus minus 2.39x 5/squareroot 63

c) 50 plus minus 2.39x 5/squareroot 64

d) 50 plus minus 2.66x 5/squareroot 64

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