Water samples are analyzed for water hardness with the following results: 102.2, 102.8, 102.9, 103.3 and 102.3 ppm CaCO3. (a) Calculate the average (b) Calculate standard deviation (c) Calculate and relative standard deviation or (the coefficient of variation
Water samples are analyzed for water hardness with the following results: 102.2, 102.8,
102.9, 103.3 and 102.3 ppm CaCO3.
(a) Calculate the average
(b) Calculate standard deviation
(c) Calculate and relative standard deviation or (the coefficient of variation).
(d) If the known value is 103.25 ppm. Does your answer agree with the known value at confidence interval of 98%?
Q3. Nitrite (NO2-) was measured by two methods (Gas chromatography and spectrophotometry) in rainwater. The average result for the gas chromatography is = 0.069 mg/L with a standard deviation of s1= 0.005 and n1= 7. The average result for the spectrophotometry is = 0.063 mg/L with a standard deviation of s2= 0.008 and n2= 5. Do the two methods agree with each other at the 95% confidence level?
Q5. Two methods were used to measure fluorescence lifetime of a dye. The average result for Method 1 is = 1.382 ns with a standard deviation of s1= 0.039 and n1= 7. The average result for Method 2 is = 1.346 ns with a standard deviation of s2= 0.015 and n2= 5. Is there a difference between the two methods at the 95% confidence level using F test?
Q6. The following set of millimolarities were obtained when standardizing a solution: 10.67, 10.71, 10.66, and 10.45. One value appears suspect. Using Q testdetermine if it can be ascribed to accidental error, at the 90% confidence level.
Q7. You obtain the set of results 192, 216, 202, 195, and 204. Using Grubbs Testat 95% confidence level, should the value 216 be retained or rejected?
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