Question 1

The combination of quality assurance and quality control in a forensic laboratory is designed to

Accepted Answer

A)  ensure all laboratories are performing the exact same methods 
B)  keep analysts busy 
C)  ensure that customers know every step that is taken inside the laboratory 
D)  ensure the goodness of the data produced 
E)  none of the above 
A)  ensure all laboratories are performing the exact same methods 
B)  keep analysts busy 
C)  ensure that customers know every step that is taken inside the laboratory 
D)  ensure the goodness of the data produced 
E)  none of the above D

Question 2

An analyst performs a series of weighings of a traceable weight and obtains a standard deviation of these weighings. What type of distribution is this considered for measurement uncertainty estimation?

Accepted Answer

A)  Type A 
B)  Type B 
C)  Type C 
D)  Combined or mixed type 
E)  none of the above 
A)  Type A 
B)  Type B 
C)  Type C 
D)  Combined or mixed type 
E)  none of the above B

Question 3

Which expression of precision will have the smallest value?

Accepted Answer

A)  repeatability 
B)  reproducibility 
C)  ruggedness 
D)  robustness 
E)  none of the above 
A)  repeatability 
B)  reproducibility 
C)  ruggedness 
D)  robustness 
E)  none of the above A

Question 4

When first establishing a calibration curve, which data points can be removed?

Accepted Answer

A)  None 
B)  A maximum of 3 out of every ten 
C)  Points on either extreme (lowest or highest concentration) 
D)  Any replicate in excess of three 
E)  none of the above 
A)  None 
B)  A maximum of 3 out of every ten 
C)  Points on either extreme (lowest or highest concentration) 
D)  Any replicate in excess of three 
E)  none of the above

Question 5

Sensitivity is another term for

Accepted Answer

A)  the warning limits of a control chart 
B)  the slope of a calibration curve 
C)  robustness 
D)  bias 
E)  none of the above 
A)  the warning limits of a control chart 
B)  the slope of a calibration curve 
C)  robustness 
D)  bias 
E)  none of the above

Question 6

A balance calibration curve (weight vs. force) as shown in the text has a slope of 7.385 and an intercept of 4.029. What weight in grams will the device show when the downward force is 267.1 (arbitrary units)? The balance reads to two decimal places.

Accepted Answer

A)  35.62 
B)  35.622 
C)  64.5 
D)  64.46 
E)  none of the above 
A)  35.62 
B)  35.622 
C)  64.5 
D)  64.46 
E)  none of the above

Question 7

The tolerance of a volumetric flask is documented as 0.05 mL. What type of distribution is this considered for measurement uncertainty estimation?

Accepted Answer

A)  Type A 
B)  Type B 
C)  Type C 
D)  Combined or mixed type 
E)  none of the above 
A)  Type A 
B)  Type B 
C)  Type C 
D)  Combined or mixed type 
E)  none of the above

Question 8

You are tasked with creating an internal standard calibration curve. For the first calibration level, the concentration of the analyte is 25.0 ppb. The concentration of the internal standard is 50.0 ppb. What is the concentration ratio value that will be used to plot the first data point?

Accepted Answer

A)  0.500 
B)  1.50 
C)  0.750 
D)  2.00 
E)  none of the above 
A)  0.500 
B)  1.50 
C)  0.750 
D)  2.00 
E)  none of the above

Question 9

Which of the following is false regarding the hypergeometric sampling method?

Accepted Answer

A)  It is designed for quantitative sampling 
B)  It provides a statistical basis for sampling 
C)  It allows statements regarding untested samples 
D)  Requires that the samples belong or appear to belong to the sample population 
E)  none of the above 
A)  It is designed for quantitative sampling 
B)  It provides a statistical basis for sampling 
C)  It allows statements regarding untested samples 
D)  Requires that the samples belong or appear to belong to the sample population 
E)  none of the above

Question 10

Suppose a data point falls below the LOQ, but above the LOD. This means that

Accepted Answer

A)  the linear equation can still be used but with extra uncertainty 
B)  the concentration is probably less than zero 
C)  the calibration curve cannot be used 
D)  the point is a false positive 
E)  none of the above 
A)  the linear equation can still be used but with extra uncertainty 
B)  the concentration is probably less than zero 
C)  the calibration curve cannot be used 
D)  the point is a false positive 
E)  none of the above

Question 11

Which expression of precision includes measurements that incorporate small changes in conditions?

Accepted Answer

A)  repeatability 
B)  reproducibility 
C)  ruggedness 
D)  robustness 
E)  none of the above 
A)  repeatability 
B)  reproducibility 
C)  ruggedness 
D)  robustness 
E)  none of the above

Question 12

What is a better term for a true value?

Accepted Answer

A)  none; it is what it is 
B)  accepted true value 
C)  consensus value 
D)  accredited value 
E)  none of the above 
A)  none; it is what it is 
B)  accepted true value 
C)  consensus value 
D)  accredited value 
E)  none of the above

Question 13

The toxicology section of a medical examiner's office creates an uncertainty budget for a drug metabolite quantitation as shown below.   Why is the contribution for the measurement assurance sample so large?

Accepted Answer

A)  Because the budget is for toxicology, not weighing drugs 
B)  Measurement assurance samples are designed to capture many contributing factors into one value 
C)  It is a type A distribution which is always larger 
D)  It is a type B distribution which is always larger 
E)  none of the above 
A)  Because the budget is for toxicology, not weighing drugs 
B)  Measurement assurance samples are designed to capture many contributing factors into one value 
C)  It is a type A distribution which is always larger 
D)  It is a type B distribution which is always larger 
E)  none of the above

Question 14

The control limits of a control chart are typically +/-

Accepted Answer

A)  1 standard deviation unit 
B)  2 standard deviation units 
C)  3 standard deviation units 
D)  4 standard deviation units 
E)  none of the above 
A)  1 standard deviation unit 
B)  2 standard deviation units 
C)  3 standard deviation units 
D)  4 standard deviation units 
E)  none of the above

Question 15

Control charts are used to

Accepted Answer

A)  monitor performance of an instrument or method over time 
B)  control fluctuations in environmental conditions 
C)  establish the reliability of a certified method 
D)  ensure traceability of a method or material 
E)  none of the above 
A)  monitor performance of an instrument or method over time 
B)  control fluctuations in environmental conditions 
C)  establish the reliability of a certified method 
D)  ensure traceability of a method or material 
E)  none of the above

Question 16

A standard addition curve is described by the linear equation y = 319.9x+3709 with concentration in ppb. What is the concentration of the analyte in ppb (to one decimal place)?

Accepted Answer

A)  37.1 
B)  319.9 
C)  <LOD 
D)  11.6 
E)  none of the above 
A)  37.1 
B)  319.9 
C)  <LOD 
D)  11.6 
E)  none of the above

Question 17

Which of the following is NOT an example of a type B contributor in measurement uncertainty?

Accepted Answer

A)  readability of a balance 
B)  reproducibility of a balance 
C)  tolerance of a calibrated pipet 
D)  rounding of the last digit in a digital display 
E)  none of the above 
A)  readability of a balance 
B)  reproducibility of a balance 
C)  tolerance of a calibrated pipet 
D)  rounding of the last digit in a digital display 
E)  none of the above

Question 18

The linear dynamic range of a calibration curve is the range in which

Accepted Answer

A)  a linear range is expected to change dynamically 
B)  concentration depends on response 
C)  the correlation coefficient is greater than 1 
D)  a linear equation applies 
E)  none of the above 
A)  a linear range is expected to change dynamically 
B)  concentration depends on response 
C)  the correlation coefficient is greater than 1 
D)  a linear equation applies 
E)  none of the above

Question 19

All of the following are true regarding measurement uncertainty except

Accepted Answer

A)  it is an estimate 
B)  it does not imply doubt 
C)  it expresses the "P" or pedigree in NUSAP 
D)  there usually many ways to estimate it 
E)  none of the above 
A)  it is an estimate 
B)  it does not imply doubt 
C)  it expresses the "P" or pedigree in NUSAP 
D)  there usually many ways to estimate it 
E)  none of the above

Question 20

The document that describes an analytical procedure used in a laboratory in detail is called the

Accepted Answer

A)  ISO accreditation requirements 
B)  OSAC consensus standard 
C)  Traceable method protocol 
D)  Standard operating procedure (SOP) 
E)  none of the above 
A)  ISO accreditation requirements 
B)  OSAC consensus standard 
C)  Traceable method protocol 
D)  Standard operating procedure (SOP) 
E)  none of the above

The combination of quality assurance and quality control in a forensic laboratory is designed to

An analyst performs a series of weighings of a traceable weight and obtains a standard deviation of these weighings. What type of distribution is this considered for measurement uncertainty estimation?

Which expression of precision will have the smallest value?

When first establishing a calibration curve, which data points can be removed?

Sensitivity is another term for

A balance calibration curve (weight vs. force) as shown in the text has a slope of 7.385 and an intercept of 4.029. What weight in grams will the device show when the downward force is 267.1 (arbitrary units)? The balance reads to two decimal places.

The tolerance of a volumetric flask is documented as 0.05 mL. What type of distribution is this considered for measurement uncertainty estimation?

You are tasked with creating an internal standard calibration curve. For the first calibration level, the concentration of the analyte is 25.0 ppb. The concentration of the internal standard is 50.0 ppb. What is the concentration ratio value that will be used to plot the first data point?

Which of the following is false regarding the hypergeometric sampling method?

Suppose a data point falls below the LOQ, but above the LOD. This means that

Which expression of precision includes measurements that incorporate small changes in conditions?

What is a better term for a true value?

The toxicology section of a medical examiner's office creates an uncertainty budget for a drug metabolite quantitation as shown below. Why is the contribution for the measurement assurance sample so large?

The control limits of a control chart are typically +/-

Control charts are used to

A standard addition curve is described by the linear equation y = 319.9x+3709 with concentration in ppb. What is the concentration of the analyte in ppb (to one decimal place)?

Which of the following is NOT an example of a type B contributor in measurement uncertainty?

The linear dynamic range of a calibration curve is the range in which

All of the following are true regarding measurement uncertainty except

The document that describes an analytical procedure used in a laboratory in detail is called the

Making Good Measurements

Chemical Fundamentals

Chromatography and Mass Spectrometry

Spectroscopy

Overview of Drug Analysis

Novel Psychoactive Substances

Fundamentals of Toxicology

Applications of Forensic Toxicology

Overview of Combustion Chemistry

Fire Investigation and Fire Debris Analysis

Explosives

Firearms and Firearms Discharge Residue

Forensic Chemistry and Trace Evidence Analysis

Filters

Exam 2: Assuring Good Measurements

The combination of quality assurance and quality control in a forensic laboratory is designed to

An analyst performs a series of weighings of a traceable weight and obtains a standard deviation of these weighings. What type of distribution is this considered for measurement uncertainty estimation?

Which expression of precision will have the smallest value?

When first establishing a calibration curve, which data points can be removed?

Sensitivity is another term for

A balance calibration curve (weight vs. force) as shown in the text has a slope of 7.385 and an intercept of 4.029. What weight in grams will the device show when the downward force is 267.1 (arbitrary units)? The balance reads to two decimal places.

The tolerance of a volumetric flask is documented as 0.05 mL. What type of distribution is this considered for measurement uncertainty estimation?

You are tasked with creating an internal standard calibration curve. For the first calibration level, the concentration of the analyte is 25.0 ppb. The concentration of the internal standard is 50.0 ppb. What is the concentration ratio value that will be used to plot the first data point?

Which of the following is false regarding the hypergeometric sampling method?

Suppose a data point falls below the LOQ, but above the LOD. This means that

Which expression of precision includes measurements that incorporate small changes in conditions?

What is a better term for a true value?

The toxicology section of a medical examiner's office creates an uncertainty budget for a drug metabolite quantitation as shown below. Why is the contribution for the measurement assurance sample so large?

The control limits of a control chart are typically +/-

Control charts are used to

A standard addition curve is described by the linear equation y = 319.9x+3709 with concentration in ppb. What is the concentration of the analyte in ppb (to one decimal place)?

Which of the following is NOT an example of a type B contributor in measurement uncertainty?

The linear dynamic range of a calibration curve is the range in which

All of the following are true regarding measurement uncertainty except

The document that describes an analytical procedure used in a laboratory in detail is called the

Making Good Measurements

Chemical Fundamentals

Chromatography and Mass Spectrometry

Spectroscopy

Overview of Drug Analysis

Novel Psychoactive Substances

Fundamentals of Toxicology

Applications of Forensic Toxicology

Overview of Combustion Chemistry

Fire Investigation and Fire Debris Analysis

Explosives

Firearms and Firearms Discharge Residue

Forensic Chemistry and Trace Evidence Analysis

Filters