A researcher may use which strategy to reduce the potential for measurement error when evaluating obesity in study subjects?
a. Measure weight, abdominal girth, and BMI on all subjects
b. Train multiple data collectors to take measurements
c. Use scales in several different clinical settings to obtain data
d. Utilize a single measure, such as BMI, applied to all subjects
Question 2
A researcher studying the effects of an intervention on symptoms measures the time from intervention to absence of symptoms and reports this in the number of days. This measure represents which level of measurement?
a. Interval
b. Nominal
c. Ordinal
d. Ratio
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