
(a)
Interpretation:
Whether the two given methods agree with each other at the
Concept Introduction:
Comparing replicate measurements:
When the two standard deviations are not significantly different from each other, the equation used is:
To Give: Whether the two given methods agree with each other at the
(a)

Answer to Problem 4.23P
The difference between the two methods of rain water is not significant.
The difference between the two methods of drinking water is not significant.
Explanation of Solution
Given data:
The results for the measurement of nitrite
Figure 1
Rainwater:
Let us assume,
The mean
The mean
The number of measurement of spectrophotometry method is
The number of measurement of spectrophotometry methods is
F-Test:
First, calculate F-Test and find whether the standard deviations of the given methods are significant or not.
For
Hence, the standard deviations of two sets of measurements are not significantly different.
Therefore, the equation used is:
Calculate
Calculate the t value:
The value of
Here,
Therefore, the difference is not significant.
Drinking water:
Let us assume,
The mean
The mean
The number of measurement of spectrophotometry method is
The number of measurement of spectrophotometry methods is
F-Test:
First, calculate F-Test and find whether the standard deviations of the given methods are significant or not.
For
Hence, the standard deviations of two sets of measurements are not significantly different.
Therefore, the equation used is:
Calculate
Calculate the t value:
The value of
Here,
Therefore, the difference is not significant.
The difference between the two methods of rain water is found out to be not significant.
The difference between the two methods of drinking water is found out to be not significant.
(b)
Interpretation:
Whether the drinking water contain more nitrite than the rain water at the
Concept Introduction:
Comparing replicate measurements:
When the two standard deviations are not significantly different from each other, the equation used is:
To Give: Whether the drinking water contain more nitrite than the rain water at the
(b)

Answer to Problem 4.23P
At the
Explanation of Solution
Given data:
The results for the measurement of nitrite
Figure 1
Gas chromatography:
The equation used is:
Calculate
Calculate the t value:
The value of
Here,
Therefore, the difference is not significant.
Spectrophotometry:
The equation used is:
Calculate
Calculate the t value:
The value of
Here,
Therefore, the difference is not significant.
At the
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Chapter 4 Solutions
Quantitative Chemical Analysis
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