A recent survey of 8 social networking sites has a mean of 13.1 million visitors for a specific month. The standard deviation was 4.1 million. a. Find the 95% confidence interval of the population mean. b. What can we conclude about this interval? c. Suppose we want the margin of error for the number of visitors to a social networking site for a specific month to be 0.6 million with 98% confidence. How many social networking sites would we have to survey?
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A recent survey of 8 social networking sites has a mean of 13.1 million visitors for a specific month. The standard deviation was 4.1 million.
a. Find the 95% confidence interval of the population mean.
b. What can we conclude about this interval?
c. Suppose we want the margin of error for the number of visitors to a social networking site for a specific month to be 0.6 million with 98% confidence. How many social networking sites would we have to survey?
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