SOLUTION: a random sample of 31 juice drinks has a mean of 99.3 and a standard deviation 41.5 calories. Construct a 95% confidence interval for the population mean number of calories per jui

Question 958256: a random sample of 31 juice drinks has a mean of 99.3 and a standard deviation 41.5 calories. Construct a 95% confidence interval for the population mean number of calories per juice drink.
My problem is that i dont know how to plug the numbers into the equation, and which numbers should i worry about.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
a random sample of 31 juice drinks has a mean of 99.3 and a standard deviation 41.5 calories. Construct a 95% confidence interval for the population mean number of calories per juice drink.
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sample mean = x-bar = 99.3
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Margin of Error = z*s/sqrt(n) = 1.96
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