CI example - a 90% confidence interval for the average...

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7/7/11 CI Example We want to see if the 20 oz Diet Coke bottles sent to the Moore School really contain 20 oz of Diet Coke. We tooka sample of 30 bottles of Diet Coke and found that the sample mean is 19.9 oz with a sample standard deviation of .25 oz. What is
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Unformatted text preview: a 90% confidence interval for the average amount of Diet Coke 7/7/11 answer • Df = 30 – 1 = 29 • α/2= (1-.9)/2 = .05 • t = 1.699 • CI = 19.9 +/- 1.699* .25 / √30 • CI = 19.9 +/- .0775 or 19.8225 to...
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This note was uploaded on 06/22/2011 for the course MGSC 291 taught by Professor Rollins during the Spring '09 term at South Carolina.

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CI example - a 90% confidence interval for the average...

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