# Ihp 525 Quiz One 1

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Statistics
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SUNY Empire State College
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Biostatistics Quiz One
1. Prospective studies on nutrition often require subjects to keep detailed daily dietary logs. In
contrast, retrospective studies often rely on recall. Which method (dietary logs or retrospective
recall) do you believe is more likely to achieve accurate results? Explain your response.
The prospective studies are more likely to have accurate results. Relying on people to remember
what they did for the entire day, or even days prior, is subject to more error because people’s
memories are faulty. If they write things down while in the moment they are likely to give a
more detailed and accurate representation of the foods that they ate.
2. We often have a choice of whether to record a given variable on either a quantitative
(continuous) or a categorical scale.
a) How does one measure age quantitatively? Age can be measured quantitatively by
measuring it in years and asking explicitly for a participant’s age.
b) Provide an example by which age can be measured categorically. Age can be measured
categorically by creating different ranges of ages that participants can identify into, such as
“18-25”, “26-34”, “35-42”, “43+”.
3. Telephone surveys may use a telephone directory to identify individuals for a study. Speculate
on the type of household that would be underrepresented by using this sampling frame. A
household that can be underrepresented in this sampling frame is a household that does not
have a landline phone that is part of the telephone directory.
4. Could the number “0000” appear in a table of random digits? If so, how likely is this? Yes this is
possible to appear in a table of random digits. There are 10,000 numbers from 0000 to 9999 so
the probability of this occurring is 1/10,000.
5. Body weights of 18 diabetics expressed as a percentage of ideal (defined as body weight divided
by ideal body weight x 100) are listed: {107, 119, 99, 114, 120, 104, 88, 114, 124, 116, 101, 121,
152, 100, 125, 114, 95, 117}. Construct a stem-and-leaf plot or box plot of these data and
describe the distribution.
Stem
Leaf
8
8
9
59
10
0147
11
444679
12
0145
13
14

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Biostatistics Quiz One 1. Prospective studies on nutrition often require subjects to keep detailed daily dietary logs. In contrast, retrospective studies often rely on recall. Which method (dietary logs or retrospective recall) do you believe is more likely to achieve accurate results? Explain your response. The prospective studies are more likely to have accurate results. Relying on people to remember what they did for the entire day, or even days prior, is subject to more error because people’s memories are faulty. If they write things down while in the moment they are likely to give a mor ...
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