Homework Help: Math(Probability)

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.

Math(Probability) - PsyDAG, Wednesday, May 4, 2011 at 1:59pm
90% = mean ą 1.645 SEm (Standard Error of the mean)

SEm = s/√(n-1)

I'll let you do the calculations.

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