Mini Test 1 - IRAT

Weeks: 1, 2, and 3

A 10 (+/- 0.03) mL volumetric pipette was used to transfer 30 mL of solution to an Erlenmeyer flask. Calculate the absolute uncertainty associated with volume transferred to the flask (i.e., the 30 mL).

B.

(+/- 0.05)

An analytical test was performed to determine the identity of an unknown trace evidence sample. Which of the following terms refers to the type of test performed?

Qualitative

Which of the following comparisons (i.e., known versus questioned) has the highest evidentiary value?

Comparison 3

Which of the following may be used to obtain a definitive identification of trace material?

Confirmatory tests

Which of the following terms refers to whether data is trustworthy; whether the trustworthiness can be verified, and to what degree of certainty?

Reliability

Which of the following phrases refers to a type of error, either positive or negative, that is inherent to a measurement and is inescapable due to uncertainty in the measuring device?

Random error

Scientific measurements must be reported concisely and accurately. In NUSAP notation, which of the following refers to the reliability of the reported data?

Assessment, A

The uncertainty associated with digitized measuring devices may be accessed from the manufacturer's website and is typically reported as each of the following except:

Dependability

As it pertains to trace material, which of the following falls within the purview of the crime scene investigation and is separate from laboratory analyses which are done to determine class and/or identity?

Recovery

The target below illustrates the outcome of a series of replicate titrations performed by a scientist. The target's bullseye represents the case where the concentration of the titrating solution is correct, and the x's represent the number of trials performed by the scientist. Given this information, which of the following describes the scientist's performance?

Low accuracy, high precision

Which likelihood ratio (i.e., LR) range and its verbal equivalent (i.e., VE) is appropriate to express the value of the evidence?

1 < LR <= 10; VE: Limited support for H_P

A sample known to be positive for tetrahydrocannabinol (THC) is incorrectly classified by an analyst as negative for THC. Which of the following phrases refers to the classification made by the analyst?

False negative

Which of the following two events are dependent?

Buying a lottery ticket and winning the lottery jackpot

Which of the following refers to a condition in probability theory in which two events cannot occur at the same time?

Mutual exclusivity

In probability theory, the range of values a probability can assume is from _______

0 to 1

Which of the following two events are not mutually exclusive?

Drawing an ace of spades from a deck of cards

What is the true positive rate (i.e., TPR)?

0.835

What is the true negative rate (i.e., TNR)?

0.905

What is the false positive rate (i.e., FPR)?

0.095

What is the false negative rate (i.e., FNR)?

0.165