In an automotive safety test conducted by the North Carolina Highway Safety Research Center, the average tire pressure in a sample of 62 tires was found to be 24 pounds per square inch, and the standard deviation was 2.1 pounds per square inch.
- What is the estimated population standard deviation for this population? (There are about a million cars registered in North Carolina.)
- Calculate the estimated standard error of the mean
- Construct a 95 percent confi dence interval for the population mean
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