Posted by **Alex** on Wednesday, May 4, 2011 at 2:52am.

Students took n = 35 samples of water from the east basin of Lake

Macatawa and measured the amount of sodium in parts per million. For their data,

they calculated notation bar x= 24.11 and s^2= 24.44. Find an approximate 90% confidence interval for μ , the mean of the amount of sodium in parts per million.

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