AHS 341 Quiz 5
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Indiana University, Purdue University, Indianapolis *
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341
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Industrial Engineering
Date
Feb 20, 2024
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rtf
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Uploaded by cillinois1
AHS 341
Health Sciences Research Methods
Quiz 5
(Q1) We are developing an instrument designed to measure perceptions of general stress. We need to determine if our new instrument measures the construct of general stress as well as the established Perceived Stress Scale
designed by Sheldon Cohen in the 1980's. To determine this, we need to measure our new instrument for ________.
Answer: Concurrent Validity
We are comparing the ability of our new instrument to measure stress with the ability of Cohen's
established Perceived Stress Scale to measure stress.
(Q2) We want to see if high school juniors' intention to consume alcohol can determine the same students' alcohol consumption behaviors while they are attending a college or university. We give high school juniors our new survey measuring their intention to consume alcohol during college. We then track these same students' consumption of alcohol
during their first two years of college. This is an example of ________.
Answer: predictive validity
We are using our new instrument of intention to consume alcohol to see how well it "predicts" high school students' actual use of alcohol during their future years in college.
(Q3) We are developing a new instrument designed to measure drivers' perceptions and practices of cell phone use while operating a motor vehicle. Perceived Consequences is one of the sub-scales measured by the new instrument, and seven instrument items are assigned
to this subscale. We want to determine the degree to which each survey item within the Perceived Consequences subscale is in alignment with each other item within the same scale. Based on this information, we are measuring _____.
Answer: internal consistency (or alpha) reliability In our above example, we are testing to see how well each item within the same Perceived Consequences scale (thus, the "internal") is in alignment (the "consistency") with each of the other items within the same scale.
(Q4) For items within a depression subscale, the alpha coefficients range between .72 and .78. Based on these alpha coefficients, how should we interpret the reliability of these items? Use Scale located in chapter 10 page 152 & 153
Answer: Fair
(Q5) A researcher is comparing nutrition knowledge between two different populations. She collects data by asking each person items from a survey. However, while asking the
survey items she provides hints to participants from one group but not for participants of the other group. This example demonstrates a lack of _________
Answer: Intra-rater objectivity
While reliability pertains to the consistency of the data collection instrument and its items, objectivity pertains to the consistency of the individual or individuals collecting the data. This example demonstrates a lack of intra-rater objectivity because the researcher is not consistent in terms of the manner in which she presents the knowledge-based items to each participant.
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