Exam 2: Assuring Good Measurements

A police officer uses a color test on a suspicious white powder. She does not know that the material is powdered sugar. No color change is observed. This is an example of a

A common method for establishing an LOD is

A laboratory validates a method for weighing solid dose drug powders on a single balance used by 4 analysts. They establish the figures of merit shown in the portion of the uncertainty budget shown below. What is the % contribution of the repeatability to the overall uncertainty rounded to zero decimals? a) 7 b) 92 c) 97 d) 1 e) none of the above

A laboratory receives a seizure of 1000 tablets. They decide to test 10% of these. These tests show that all tablets contain methamphetamine. What can the laboratory report?

An internal standard curve is described by the linear equation y = 20.42x - 0.7223. A sample is analyzed and the ratio of the area counts of the target analyte to the internal standard is 1.052. The internal standard concentration is 75.0 ppb. What is the concentration of the target analyte in the sample (ppb, 2 decimal places)?

A laboratory uses the hypergeometric method for sampling a large seizure. The SOP requires a confidence level of 95%. What can the analyst say in a report or in court regarding this value?

An analyst performs and external standard calibration for fentanyl and obtains the following data points (concentration in ppb, area counts): 20.0, 9599 50.0, 21456 100.0, 45326 250.0, 102391 500.0, 210561 What is the R2 value of the resulting linear equation (3 decimal places)?

To use an internal standard method, which samples must contain an added internal standard?

Why is the combined uncertainty multiplied by the coverage factor (k)?

Which approach to estimation of uncertainty is based on many individual contributors identified in a cause and effect diagram?

Why does accuracy have two components?

Sampling based on the hypergeometric distribution function is an example of

Suppose you needed a generally accepted definition of a term such as accuracy. Which resource would be the best choice?

What is the key difference between accreditation and certification in the forensic context?

Traceability means that a measured value

In the context of qualitative methods, what is a decision threshold?

The documentation that shows where is evidence is and who controls it all all times is the

You are tasked with creating an internal standard calibration curve. For the third calibration level, the area response of the analyte is 19087. The area of the internal standard is 1200.0 What is the area ratio value that will be used to plot the first data point?

Quality assurance is defined here as

What is meant by the term "cradle to grave" relative to QA/QC?