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HSC3100 Exam 3.
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Exam of 4 pages for the course BUSMHR 3100 at BUSMHR 3100 (HSC3100 Exam 3.)
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HSC3100 Exam 3Random error refers to... - ANS-poor precision, sampling error, variability in
measurement
The validity of a study is... - ANS-the degree to which inference can be drawn from a
study considering methods, representativeness and nature of the population
Internal validity of a study is... - ANS-the lack of error in measurement, proper selection
of study groups
External validity of a study is... - ANS-the ability to extrapolate from a population to a
target population
Increasing the number of measurements or readings of a measure increases... -
ANS-precision
When the study sample differs from the parent population, this refers to... - ANS-random
error, sampling error
One way to reduce sampling error is to... - ANS-increase the sample size
One can decrease variability in measurement is data are... - ANS-objective, reliable,
accurate, reproducible
Two automated blood cell counters are tested twice using a prepared suspension of
leukocytes containing 8,000 calls/mm. The cell counts by device A are 8,400 cells/mm
the first time and 8,350 cells/mm the second. Device B's counts are 8,200 and 7,850
cells/mm, respectively.
Which device gives leukocyte counts with greater validity? - ANS-device B
Which device gives leukocyte counts with greater reliability? - ANS-device A
Types of systematic error - ANS-selection bias, information bias, confounding
Distortions resulting from recruitment procedures and factors that influence participation
in the study - ANS-selection bias
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