hardness of city water

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Two analysts took repeated readings on the hardness of city water. Assuming that the readings of analyst i constitute a sample from a normal population having variance width=compute a 95 percent two-sided confidence interval forwidth= when the data are as follows:

Coded Measures of Hardness

Analyst

Analyst

.46

.82

.62

.61

.37

.89

.40

.51

.44

.33

.58

.48

.48

.23

.53

.25

 

.67

 

.88

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