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A random sample of 30 Suffolk University employees had an average commute length of 11.7 miles,...

A random sample of 30 Suffolk University employees had an average commute length of 11.7 miles, with a standard deviation of 8.5 miles. What is the 90% ​confidence interval ​for the ​mean​ commute length of all Suffolk employees? Use 4 non-zero decimal places in your calculations.
(a) Find the tα/2 , df
(b) Find σx
(c) Find the margin of error (MoE) and construct the confidence interval
Math   Statistics-And-Probability   
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