ScholarMatic: Explanation & Answer
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1.
Prospective studies on nutrition often require
subjects to keep detailed daily dieary 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.
2. We often have a choice of whether
to record a given variable on either a quantitative or a categorical
scale. How does one measure age
quantitatively? Provide an example by
which age can be measured categorically.
3.
Telephone surveys may use a telephone directory
to identify individuals for study.
Speculate on the type of household that
would be undercovered by using this
sampling frame.
4.
Could the number ‘0000” appear in a table of
random digits? If so, how likely is this?
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 of these data
and interpret your findings.
6.
Name three measures of central location
7.
To assess the air quality in a surgical suite,
the presence of colony-forming spores per cubic meter of air is measured on
three successive days. The results are
as follows: {12, 24, 30}. Calculate the
mean and standard deviation for these data.
8.
In a lottery game, a person must select 5
numbers from a total of 40. Tracy has
chosen 7, 8, 9, 10, 11. Jaime has chosen
39, 17, 37, 5, 28. Who has a greater
chance of winning?
9.
In a box, there are 8 orange, 7 blue, and 6 red
balls. One ball is selected
randomly. What is the probability that
it is neither orange nor red?
10.
A
_______________is a numerical quantity that takes on different values
depending on chance. There are two types
of random variables. _____________________________ form a countable set of possible values. ______________________________ form an unbroken continuum of possible
values.
ScholarMatic: Explanation & Answer
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