Construct a 95% confidence interval estimate
Construct a 95% confidence interval estimate for the population mean MPG of 2008 sedans under $20,000. (Round to one decimal place.)
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Would you agree with this claim if the random sample showed an average of 23,500 km and a standard deviation of 3,900 km? Use 0.01 level of significance.
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The standard IQ test has a mean of 100 and a standard deviation of 13. We want to be 98% certain that we are within 2 IQ points of the true mean. Determine the required sample size.
The customer service department claims that the mean time to correct a shipping error is 10 minutes. A random sample of 60 claims from company records showed the mean to be 9.2 minutes with a standard deviation of 4.7 minutes. At the .02 signific
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