Midterm1 BIOST310 Sp2018 KEY.pdf

# Midterm1 BIOST310 Sp2018 KEY.pdf - Biostatistics 310...

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Biostatistics 310 Midterm Exam 1 Spring 2018 Name : __KEY___________________________________ There are 6 multi-part questions for a total of 17 points. For multiple choice questions, circle your answer. Please show your work (i.e., formulas) for questions that involve calculations You may leave mathematical expressions unevaluated 1. (1 point) The Wong-Baker FACES Pain Rating Scale is a set of 6 facial images used to assess pain severity levels in children. Children are asked to pick from the images (below) to tell which one most looks like how they feel. What type of measurement is the FACES Pain Rating Scale? A. Quantitative B. Ordinal categorical C. Nominal categorical 2. (1 point) Another method of measuring pain is the Visual Acuity Scale (VAS) which consists of a 100 millimeter scale from 0 to 100 with low and high endpoints of “no pain” and “worst pain”, respectively. Patients are asked to make a mark on the scale to indicate their pain, which is recorded in millimeters. What type of measurement is the VAS? A. Quantitative B. Ordinal categorical C. Nominal categorical Since we measure in millimeters this is considered a quantitative variable. Partial credit was given for “ordinal”.

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3. (4 points) A study was performed to validate the Wong-Baker FACES relative to the VAS, in which 120 children rated their pain on both scales. Figure 1 below presents the relationship between the FACES and VAS scales. A. What type of plot is presented in Figure 1? i. Barplot ii. Histogram iii. Stem and leaf plot iv. Boxplot v. Contingency table vi. Scatterplot B. Which Wong-Baker face (0-5) corresponds to VAS measurements with the greatest inter-quartile range ? Face #5 has the greatest IQ range (distance from bottom of box to top). Looks to be about 75-100 or 25 C. What is the approximate median VAS for patients who chose Wong-Baker scale 2 “hurts a little more”? Looks to be about 37. See annotated figure 1 below. D. Does this figure appear to indicate that the FACES and VAS values are associated? Why or why not? YES. Each face as they go from happy to sad seems to have overall higher VAS values. How to measure “overall higher VAS” , would be using some measure of central tendency like mean or median.
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