Construct a 90% confidence interval for of U.S. companies trading with firms in India.

Posted on 2013-10-16 15:21:00 in Statistics by YURI PRICE

A survey was taken of U.S. companies that do business with firms in India. One o the question on the survey was: Approximately how many years has your company been trading with firms in India? A random sample of 44 responses to this question yielding a mean of 10.455 years. Suppose the population standard deviation for this question is 7.7 years. Using this information, construct a 90% confidence interval for of U.S. companies trading with firms in India. 

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