Lab Analyst Complete Set – EXAM STUDY
GUIDE 2026/2027 COMPLETE QUESTIONS
WITH VERIFIED CORRECT ANSWERS || 100%
GUARANTEED PASS
When calculating control limits, data should be rejected if - ANSWER A known error has
occured
Quality assurance is - ANSWER A definitive plan for laboratory operation that specifies the
measures used to produce data of known precision and bias
A set of operating principles that is strictly followed during sample collection and analysis
Data of known and defensible quality
To calculate the geometric mean, measurements must be converted to - ANSWER
Logarithms
The standard deviation is - ANSWER The square root of the varience
A good quality control program includes at least seven elements: certification of operator
competence, recovery of known additions, analysis of externally supplied standards, analysis of
reagent blanks, calibration with standards, analysis of duplicates, and - ANSWER
Maintenance of control charts
, Values found above the highest standard should not be reported unless - ANSWER An initial
demonstration of greater linear range has been made, no instrument parameters have been
changed, and the value is fewer than 1.5 times the highest standard
Precision in analytical determination is a measure of - ANSWER Repeatability
The measure of a consistent deviation of measured values from the true value caused by
systemic errors in a procedure is called - ANSWER Bias
A measure of bias and precision of an analytical procedure that reflects the closeness of a
measured value to the true value is called - ANSWER Accuracy
The standard used to determine the state of instrument accuracy between periodic calibrations
is called - ANSWER Check standard
To determine whether matrix effects influenced an analysis, the analyst should - ANSWER
Determine the recovery of known additions
At a minimum, how many calibration standards should be used when an analysis is initiated? -
ANSWER Three
When using known additions for the assessment of analytical quality, the addition of known
material should be - ANSWER One and ten times the ambient level
Quality control analysis of externally supplied standards is used to check - ANSWER
Accuracy
,On a control chart, how many standard deviations are the warning limit from the average
percent recovery? - ANSWER 2
When a measurement exceeds the control limits, you should - ANSWER Repeat the analysis
immediately
On a quality control chart, what percentage of values should fall between the warning limits -
ANSWER 95%
A good quality control program should include - ANSWER Duplicate analyses, blanks, and
control standards
Which of the following is the correct definition of "significant figures"? - ANSWER All digits
known to be true and one last digit in doubt
If TSS is reportable to two significant figures, how do you report the calculated value 109.3 -
ANSWER 110
When a series of numbers is added, the sum should be rounded off to - ANSWER The same
number of decimal places as the figure with the least number of decimal placed
23.46+2.666+5.1=31.226
Sig figs? - ANSWER 31.2
A BOD is calculated as 23.50 and should be rounded to two significant figures - ANSWER 24
Round the result of multiplication or division calculations to the number of significant figures
present - ANSWER In the factor with the least significant figures
, Another expression of the mean is the - ANSWER Average
The expression
[(x - avg x)^2/(n x 1)]^(1/2)
Indicates the estimate of the - ANSWER Standard deviation
On a means quality control chart, the control limit is how many standard deviations from the
mean? - ANSWER 3
What is an aliquot of analyte-free water that is carried through the entire testing process
called? - ANSWER Reagent blank
Graphic representations of quality control measurements performed on a regular basis are -
ANSWER Control charts
Total Kjeldahl nitrogen is the sum of - ANSWER Ammonia and organic nitrogen
The Kjeldahl method is a method for determining - ANSWER Nitrogen
The most oxidized form of nitrogen that may be found in water and wastewater is - ANSWER
Nitrate
The cadmium-reduction method is recommended for determining what concentration range of
nitrate nitrogen? - ANSWER 0.01 to 1.0 ppm
What is the interference source for the ammonia- specific ion electrode? - ANSWER Amines:
GUIDE 2026/2027 COMPLETE QUESTIONS
WITH VERIFIED CORRECT ANSWERS || 100%
GUARANTEED PASS
When calculating control limits, data should be rejected if - ANSWER A known error has
occured
Quality assurance is - ANSWER A definitive plan for laboratory operation that specifies the
measures used to produce data of known precision and bias
A set of operating principles that is strictly followed during sample collection and analysis
Data of known and defensible quality
To calculate the geometric mean, measurements must be converted to - ANSWER
Logarithms
The standard deviation is - ANSWER The square root of the varience
A good quality control program includes at least seven elements: certification of operator
competence, recovery of known additions, analysis of externally supplied standards, analysis of
reagent blanks, calibration with standards, analysis of duplicates, and - ANSWER
Maintenance of control charts
, Values found above the highest standard should not be reported unless - ANSWER An initial
demonstration of greater linear range has been made, no instrument parameters have been
changed, and the value is fewer than 1.5 times the highest standard
Precision in analytical determination is a measure of - ANSWER Repeatability
The measure of a consistent deviation of measured values from the true value caused by
systemic errors in a procedure is called - ANSWER Bias
A measure of bias and precision of an analytical procedure that reflects the closeness of a
measured value to the true value is called - ANSWER Accuracy
The standard used to determine the state of instrument accuracy between periodic calibrations
is called - ANSWER Check standard
To determine whether matrix effects influenced an analysis, the analyst should - ANSWER
Determine the recovery of known additions
At a minimum, how many calibration standards should be used when an analysis is initiated? -
ANSWER Three
When using known additions for the assessment of analytical quality, the addition of known
material should be - ANSWER One and ten times the ambient level
Quality control analysis of externally supplied standards is used to check - ANSWER
Accuracy
,On a control chart, how many standard deviations are the warning limit from the average
percent recovery? - ANSWER 2
When a measurement exceeds the control limits, you should - ANSWER Repeat the analysis
immediately
On a quality control chart, what percentage of values should fall between the warning limits -
ANSWER 95%
A good quality control program should include - ANSWER Duplicate analyses, blanks, and
control standards
Which of the following is the correct definition of "significant figures"? - ANSWER All digits
known to be true and one last digit in doubt
If TSS is reportable to two significant figures, how do you report the calculated value 109.3 -
ANSWER 110
When a series of numbers is added, the sum should be rounded off to - ANSWER The same
number of decimal places as the figure with the least number of decimal placed
23.46+2.666+5.1=31.226
Sig figs? - ANSWER 31.2
A BOD is calculated as 23.50 and should be rounded to two significant figures - ANSWER 24
Round the result of multiplication or division calculations to the number of significant figures
present - ANSWER In the factor with the least significant figures
, Another expression of the mean is the - ANSWER Average
The expression
[(x - avg x)^2/(n x 1)]^(1/2)
Indicates the estimate of the - ANSWER Standard deviation
On a means quality control chart, the control limit is how many standard deviations from the
mean? - ANSWER 3
What is an aliquot of analyte-free water that is carried through the entire testing process
called? - ANSWER Reagent blank
Graphic representations of quality control measurements performed on a regular basis are -
ANSWER Control charts
Total Kjeldahl nitrogen is the sum of - ANSWER Ammonia and organic nitrogen
The Kjeldahl method is a method for determining - ANSWER Nitrogen
The most oxidized form of nitrogen that may be found in water and wastewater is - ANSWER
Nitrate
The cadmium-reduction method is recommended for determining what concentration range of
nitrate nitrogen? - ANSWER 0.01 to 1.0 ppm
What is the interference source for the ammonia- specific ion electrode? - ANSWER Amines:
