SOLUTION: The pH value of 5 water samples taken from a small lake follow: 7.3, 7.6, 7.2, 7.9, and 7.8. The true standard deviation of water of the lake is unknown. A 95% upper confidence int

Question 1162308: The pH value of 5 water samples taken from a small lake follow: 7.3, 7.6, 7.2, 7.9, and 7.8. The true standard deviation of water of the lake is unknown. A 95% upper confidence interval for the pH is:
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
mean is 7.56
s is 0.30
95% CI half-interval is t 0.975, df=4*s/sqrt(n)=2.776*0.30/sqrt(5)
=0.37
the interval is (7.19, 7.93)
Calculator will give (7.18, 7.94) due to rounding differences.
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