The results of a Wagner turbidity test performed on 15
Chapter 7, Problem 7.46(choose chapter or problem)
The results of a Wagner turbidity test performed on 15 samples of standard Ottawa testing sand were (in microamperes) 26.7 25.8 24.0 24.9 26.4 25.9 24.4 21.7 24.1 25.9 27.3 26.9 27.3 24.8 23.6 a. Is it plausible that this sample was selected from a normal population distribution? b. Calculate an upper confidence bound with confidence level 95% for the population standard deviation of turbidity
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