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95% confidence the mean intake of calcium within 20 units of the true mean if the intake is from a normal distribution with a variance of 1900 units?...

What sample size is needed to estimate with 95% confidence the mean intake of calcium within 20 units of the true mean if the intake is from a normal distribution with a variance of 1900 units?
a. What is E, your margin of error?
b. What is your standard deviation?
c. What is alpha?
d. What is the z-value for alpha/2?
e. What is the sample size?

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