Business statistics Value of t and confidence interval
The U.S. Dairy Industry wants to estimate the mean yearly milk consumption. A sample of 13 people reveals the mean yearly consumption to be 58 gallons with a standard deviation of 18 gallons. 
(c) 
For a 90 percent confidence interval, what is the
value of t? (Round your answer to 3 decimal
places.) Value of t is what _______________ 
(d) 
Develop the 90 percent confidence interval for the population mean. (Round your answers to 3 decimal places.) Confidence interval for the population mean is _______and ________. Need both percents for this 

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