1: Find the confidence level related to the critical value zα/2=1.555
1: Find the confidence level related to the critical value zα/2=1.555
2: A survey of 64 popular restaurants is used to estimate the mean number of kitchen employees. Assume that the number of kitchen employees is right-skewed, which distribution should be used to construct the confidence interval?
3: The health department is estimating the percentage of smokers among adults aged between 18 - 22. A random sample of 50 students was used and 16 are reported as smokers. Find the corresponding critical value for calculating 97.5% confidence interval. Round your answer to three decimal places.
4: A company owns 520 cars, the manager wants to know what is the mean distance traveled during the past 30 working days. So she gathered the information for 13 cars. Assuming the distances traveled are
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