Amajor tire manufacturer wishes to estimate the mean tread life in miles for one of its tires. it wishes to develop a confidence interval estimate that would have a maximum sampling error of 500 miles with 90 percent confidence. a pilot sample of n=50 tires showed a sample standard deviation equal to 4,000 miles. based on this information, what is the required sample size?

The Z-value for a 90 percent confidence is 1.645

To find the sample size use the formula:

Sample size = Z-value x SD / error)^2

Using the provided information:

SD = 4,000 miles

Error = 500 miles

Sample size = ((1.645) (4000)/ 500)^2 = 173.18 = 174

q1 a person or thing situated away or detached from the main body or system. a cluster is a a mash of many things.

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i think the answer is seven, for if i'm being useless °ω°

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