Lab Instructions_ Data Analysis Mission Memo (Spring A 2024 Onward)
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Data Analysis Lab Instructions
You will be using Microsoft Excel to complete this assignment. We would recommend
watching the following Excel tutorial videos before you begin:
●
#1 Getting Started
;
#1 Getting Started transcript
●
#2 Finding Stuff and Getting Around
;
#2 Finding Stuff and Getting Around
transcript
●
#3 Data: Entering and Formatting
;
#3 Data: Entering and Formatting transcript
Background
Cholesterol
is essential to normal function of our bodies, but too much cholesterol
negatively affects health. Cholesterol circulates in the blood, where it accumulates on the
walls of arteries and limits the flow of blood. If cholesterol blocks blood vessels severely,
a person can suffer a
heart attack
and
stroke
. According to the
U.S. Department of Health
and Human Services
, a concentration of cholesterol greater than 240 mg (milligram)/dL
(deciliter, or 100 ml) would be considered too high.
You work for a company that plans to test a new drug, designed to lower the
concentration of cholesterol circulating in blood. To recruit suitable patients for this test,
your company plans to advertise the study, targeting people who are most likely to have
high cholesterol. To design the advertising, your company needs to know which target
audience is most likely to have high cholesterol. In general, advertising is targeted
toward people of a particular age.
Fortunately, doctors routinely order tests that quantify the concentration of cholesterol
circulating in the blood of their patients. Therefore, your company could cooperate with a
nearby lab to obtain anonymous samples of cholesterol concentrations for people of
various ages. The sample was divided into two groups: 1) people between the ages of 20
and 44 years, and 2) people between the ages of 45 and 64 years. You have been asked
to analyze the data and conclude which group is more likely to have high cholesterol.
Step 1: Anticipate your analysis.
To construct a sound argument, one must anticipate the evidence needed to support a
claim. In this assignment, you can choose between two claims:
Potential Claim 1:
People between the ages of 20 and 44 years are more likely to have
high cholesterol than people between the ages of 45 and 64 years.
Potential Claim 2:
People between the ages of 45 and 64 years are more likely to have
high cholesterol than people between the ages of 20 and 44 years.
In each of the three figures below, the y-axis represents the median concentration of
cholesterol in the blood, with higher values indicating more cholesterol. The x-axis
compares two categories of age: 20-44 years and 45-64 years.
1.
Select the figure that best illustrates what one should expect to observe
if people
between the ages of 20 and 44 years are more likely to have high cholesterol
than people between the ages of 45 and 64 years
.
a.
Figure A
b.
Figure B
c.
Figure C
Step 2: Examine the frequency distribution of cholesterol for
each category of people.
To determine whether people are more likely to have higher cholesterol at ages 20-44
years or at ages 45-64 years, we must first examine the frequency of high cholesterol
among people in each age category. For any variable, such as cholesterol concentration,
we can use a
frequency distribution
to visualize the number of observations in a range
of values. (Excel tutorial
#8 Calculating Frequencies
;
#8 Calculating Frequencies
transcript
)
To construct a frequency distribution, we must first generate a table of frequencies in
each range of values. Let’s consider an example.
Imagine that you asked 20 students to tell you how many hours (h) they worked each
day. Let’s call this variable the
daily duration of work
. Here is a list of the data:
[5, 6, 3, 3, 2, 4, 7, 5, 2, 3, 5, 6, 5, 4, 4, 3, 5, 2, 5, 3].
Rather than look at this long list, we can conveniently express the set of values as a
frequency table
. Recall that a
frequency
equals the number of times a value occurs in a
set of data. Table 1 summarizes the frequencies of values in the set of data listed above.
Table 1a.
Frequencies of work duration
in a sample of 20 students.
Duration of Work (h)
Frequency
1
0
2
3
3
5
4
3
5
6
6
2
7
1
8
0
In some cases, the data span a wide range of values, requiring one to compute the
frequency of values in a range rather than the frequency of each value. For example,
below is a frequency table for the same data, using values in a range of 2. (Excel tutorial
#8 Calculating Frequencies
;
#8 Calculating Frequencies transcript
)
Table 1b.
Frequencies of work duration
in a sample of 20 students.
Duration of Work (h)
Frequency
1-2
3
2-4
8
4-6
8
6-8
1
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Note, the range of values is chosen to balance the need to compress the table with the
need to resolve any patterns. Sometimes, one needs to use a larger range to compress
the table or use a smaller range to resolve subtle patterns.
Once we have a frequency table, we can plot a frequency distribution—a bar plot in
which the height of each bar represents the frequency of observations within a certain
range. For example, the figure below shows a frequency distribution for the data in Table
1.
Figure 1.
The frequency distribution of work duration
for a sample of 20 students.
Directions
: For questions 2-4, download the “Data Analysis Workbook” from your Canvas
assignment and refer to the sheet titled “DATA- Cholesterol.” These data contain the
concentrations of cholesterol in people at the ages of 20-44 years (sample size = 100)
and people at the ages of 45-64 years (sample size = 100). This sheet contains two
columns of data, each of which represents the concentration of cholesterol for people in
an age category. Use Excel for calculations, modeling, and graphing. Round all calculated
values to the nearest tenth of a decimal place. For example, if you calculate the value as
3.8218, round to 3.8.
Excel tutorials:
●
#8 Calculating Frequencies
;
#8 Calculating Frequencies transcript
●
#9 Saving Plots as Images
;
#9 Saving Plots as Images transcript
2.
Use the sheet (tab) labeled “Question 2” in your Data Analysis Workbook to
complete the frequency table below, listing the concentration of cholesterol.
Table 1.
The frequencies of values for cholesterol concentration of people in two age
categories: 20-44 years and 45-64 years.
Cholesterol Ranges
(mg/dL)
Cholesterol Bins
(mg/dL)
Frequency among
people at 20-44 years
of age
Frequency among
people at 45-64
years of age
120-140
140
140-160
160
160-180
180
180-200
200
200-220
220
220-240
240
240-260
260
260-280
280
280-300
300
300-320
320
320-340
340
3.
Use the “Question 3” sheet to plot a frequency distribution (also known as a
histogram) of the
concentration of cholesterol in people between 20 and 44
years of age
. Your plot should follow the formatting guidelines listed below.
Formatting Instructions
●
Chart type: 2D Bar Chart
●
Quick layout: Layout 1
●
Chart title “Cholesterol for People Ages 20-44 Years”
●
Y-axis title: “Frequency”; Font size = 16
●
Y-axis numbers: Font size = 14
●
X-axis title: “Cholesterol Ranges”; Font size = 16
●
X-axis numbers: Font size = 14
●
Bins = Use the following 11 bins: 120-140, 140-160, 160-180, 180-200,
200-220, 220-240, 240-260, 260-280, 280-300, 300-320, 320-340
4.
Use the “Question 4” sheet to plot a frequency distribution (also known as a
histogram) of the
concentration of cholesterol in people between 45 and 64
years of age
. Your plot should follow the formatting guidelines listed below.
Formatting Instructions
●
Chart type: 2D Bar Chart
●
Quick layout: Layout 1
●
Chart title: “Cholesterol for People Ages 45-64 Years”
●
Y-axis title: “Frequency”; Font size = 16
●
Y-axis numbers: Font size = 14
●
X-axis title: “Cholesterol Ranges”; Font size = 16
●
X-axis numbers: Font size = 14
●
Bins = Use the following 11 bins: 120-140, 140-160, 160-180, 180-200,
200-220, 220-240, 240-260, 260-280, 280-300, 300-320, 320-340
Step 3: Compare the frequency distributions of cholesterol
concentration between people of different ages.
Although a frequency distribution enables one to see major features of the data, we
often need to quantify these features. For example, we may want to know the most
commonly observed value of a variable. Or we may want to know the smallest or largest
value observed. (Excel tutorial
#6 Functions: Describing Data
;
#6 Functions: Describing
Data transcript
)
For example, consider the five observations listed in Column A of the spreadsheet
below:
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A
B
1
Variable 1
2
5
3
3
4
7
5
4
6
6
You could better understand the distribution of these data by examining such quantities
as the minimum, maximum, mode, and median. Microsoft Excel has a built-in function
designed to calculate each of these quantities.
Each Excel function requires a set of arguments and returns a value defined by the
function. Let’s review four functions that you will use in this assignment.
A) Median
—The MEDIAN requires a list of numbers and Excel returns the median, or
central value in a list of values sorted from smallest to largest. The following syntax would
be used to compute the median of Variable 1 in the spreadsheet above:
=median(A2:A6)
where the word “median” tells Excel which function to use. The argument in parentheses,
A2:A6, tells Excel to use the list of values A2 through A6. For a small sample, we can also
list the numbers directly as follows:
=median(5, 3, 7, 4, 6)
In either case, Excel will return a median value of 5, which is the central value in the
sorted list— 3, 4,
5
, 6, 7.
B) Minimum
—The MIN function requires a list of numbers and returns the minimal value
in the list. The following syntax would be used to compute the minimum of Variable 1 in
the spreadsheet above:
=min(A2:A6)
C) Maximum
—The MAX function requires a list of numbers and returns the maximum
value in the list. The following syntax would be used to compute the maximum of
Variable 1 in the spreadsheet above:
=max(A2:A6)
D) Mode
—The MODE function requires a list of numbers and returns the most frequent
value in the list. The following syntax would be used to compute the mode of Variable 1 in
the spreadsheet above:
=mode(A2:A6)
Directions
: For questions 5-12, use the Data Analysis Workbook and refer to the sheet
titled “Q5-12 Descriptive Statistics.” These data contain the concentrations of cholesterol
in people at the ages of 20-44 years (sample size = 100) and people at the ages of 45-64
years (sample size = 100). This file contains two columns of data, each of which
represents the concentration of cholesterol for people in an age category. Use Excel for
calculations, modeling, and graphing.
Excel tutorial:
●
#6 Functions: Describing Data
;
#6 Functions: Describing Data transcript
5.
Estimate the
median
of cholesterol concentration in
people at 20–44 years of
age
. Use Excel for calculations, modeling, and graphing. Round all calculated
values to the nearest whole number. For example, if you calculate the value as
3.8218, round to 4.
Median (for people 20-44 years of age) =
6.
Estimate the
minimum
of cholesterol concentration in
people at 20–44 years of
age
. Use Excel for calculations, modeling, and graphing. Round all calculated
values to the nearest whole number. For example, if you calculate the value as
3.8218, round to 4.
Minimum (for people 20-44 years of age) =
7.
Estimate the
maximum
of cholesterol concentration in
people at 20–44 years of
age
. Use Excel for calculations, modeling, and graphing. Round all calculated
values to the nearest whole number. For example, if you calculate the value as
3.8218, round to 4.
Maximum (for people 20-44 years of age) =
8.
Estimate the
mode
of cholesterol concentration in
people at 20–44 years of age
.
Use Excel for calculations, modeling, and graphing. Round all calculated values to
the nearest whole number. For example, if you calculate the value as 3.8218,
round to 4.
Mode (for people 20-44 years of age) =
9.
Estimate the
median
of cholesterol concentration in
people at 45–64 years of
age
. Use Excel for calculations, modeling, and graphing. Round all calculated
values to the nearest whole number. For example, if you calculate the value as
3.8218, round to 4.
Median (for people 45-64 years of age) =
10. Estimate the
minimum
of cholesterol concentration in
people at 45–64 years of
age
. Use Excel for calculations, modeling, and graphing. Round all calculated
values to the nearest whole number. For example, if you calculate the value as
3.8218, round to 4.
Minimum (for people 45-64 years of age) =
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11. Estimate the
maximum
of cholesterol concentration in
people at 45–64 years of
age
. Use Excel for calculations, modeling, and graphing. Round all calculated
values to the nearest whole number. For example, if you calculate the value as
3.8218, round to 4.
Maximum (for people 45-64 years of age) =
12. Estimate the
mode
of cholesterol concentration in
people at 45–64 years of age
.
Use Excel for calculations, modeling, and graphing. Round all calculated values to
the nearest whole number. For example, if you calculate the value as 3.8218,
round to 4.
Mode (for people 45-64 years of age) =
Step 4: For each age category, calculate the probability that a
person has high cholesterol.
Excel tutorials:
●
#4 Data: Basic Calculations
;
#4 Data: Basic Calculations transcript
●
#5 Data: Sorting
;
#5 Data: Sorting transcript
●
#8 Calculating Frequencies
;
#8 Calculating Frequencies transcript
Now that we know the frequency distribution of cholesterol for people in each age
category, we can use the frequencies to infer the probabilities of observing certain
values. Recall that the drug company wants to know the probability that a person in a
certain age category has high cholesterol (> 240 mg/dL). That way, they can target the
appropriate demographic for their drug study.
The probability of an outcome equals the
relative frequency
of that outcome.
To calculate the relative frequency of high cholesterol, follow these steps:
1)
Count the number of people with high cholesterol—a concentration greater than
240 mg dL. This value equals the frequency.
2)
Determine the total number of people in the sample, regardless of their
cholesterol concentration. This value equals the sample size.
3)
Divide the number of people with high cholesterol (frequency) by the total number
of people in the sample (sample size). Convert the resulting value to a percentage
by multiplying by 100. This percentage equals the relative frequency.
For example, consider the body masses of 10 horses, shown in the table below.
Horse
Body Mass (kg)
1
387
2
390
3
390
4
391
5
402
6
402
7
405
8
411
9
412
10
416
Let’s calculate the probability that a horse will have a body mass less than 392 kg
(kilograms). First, we count the number of horses with a body mass less than 392 kg. To
make this task easier, the data are sorted according to body mass (from least to greatest).
Horses 1 through 4 have body masses less than 392 kilograms (kg); therefore, the
frequency equals 4.
Next, we divide the frequency of horses with masses less than 392 kg by the total
number of horses in the sample (sample size = 10):
Relative frequency = 4 / 10 = 0.4.
This relative frequency of 0.4 can also be expressed as a percentage. Multiplying 0.4 by
100 yields a percentage of 40%:
0.40 ∙ 100 = 40%
Thus, the probability that a horse has a body mass less than 392 kg equals 40%.
Directions
: For questions 13-14, use the Data Analysis Workbook and refer to the sheet
titled “Q13-14 Probability Analysis.” These data contain the concentrations of cholesterol
in people of ages 20-44 years (sample size = 100) and people of ages 45-64 years
(sample size = 100). This file contains two columns of data, each of which represents the
concentration of cholesterol for people in an age category. Use Excel for calculations,
modeling, and graphing.
Excel tutorials:
●
#4 Data: Basic Calculations
;
#4 Data: Basic Calculations transcript
●
#5 Data: Sorting
;
#5 Data: Sorting transcript
●
#8 Calculating Frequencies
;
#8 Calculating Frequencies transcript
13. Calculate the probability that a person in the age category of 20–44 years has
high cholesterol. Round all calculated values to a whole number. For example, if
you calculate the value as 3.8218, round to 4.
14. Calculate the probability that a person in the age category of 45–64 years has
high cholesterol. Round all calculated values to a whole number. For example, if
you calculate the value as 3.8218, round to 4.
Step 5: Conclude which category of people are more likely to
have high cholesterol: people at ages 20–44 years or people at
ages 45–64 years.
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Given your analyses in Steps 1 through 4, you are ready to conclude whether the drug
company should target their advertising toward people at ages 20-44 years or people at
ages 45-64 years. Recall that the company wants to recruit people in the age category
with the greater probability of having high cholesterol.
When making a claim about which group of people the drug company should target for
their study of high cholesterol, be sure to provide your reasoning, highlighting the
relevant evidence supporting your claim.
15. Select the claim that is better supported by the evidence.
a.
The drug company should target advertising toward people at 20–44 years
of age.
b.
The drug company should target advertising toward people at 45–64 years
of age.
16. Summarize the evidence that supports your claim, including how you determined
whether the drug company should target people at 20-44 years of age or people
45-64 years of age, based on probability. Use quantitative evidence when
possible.
Step 6: Consider how you would describe your data with a
model.
Now that you have completed your analysis, let’s reflect on what you have accomplished.
You started with data describing the cholesterol concentrations of people of different
ages. You plotted a frequency distribution of the data for each age category of people.
You also quantified the shape of each distribution by calculating a median, mode,
minimum, and maximum. Finally, you used the frequencies of cholesterol concentration
greater than 240 mg/dL to calculate the probability that a person in each age category
has high cholesterol.
Although your analyses focused on people with high cholesterol, other scientists might
want to know the probability that a person has low cholesterol. Seems like a waste of
Data suggests the probability of the subjects in the age group 45-64 are more likely to have high cholesterol. Therefore this points them in the right direction.
time and effort for other scientists to repeat your calculations every time a new problem
arises. For this reason, scientists aim to effectively communicate their results to others.
How would you communicate your knowledge about cholesterol? You might tell
someone the median, mode, minimum, and maximum of the data that you analyzed;
those few numbers communicate a lot of information to someone who understands a
frequency distribution. Still, one cannot calculate a probability from these values alone;
one needs to know the frequencies of specific values to calculate a probability.
Fortunately, mathematics enables us to model a frequency distribution and quickly,
accurately, and precisely share information about probabilities. Specifically, we will use a
form of mathematics called a probability distribution.
A probability distribution is a
model
of a frequency distribution. Think of this model as a
cartoon representing the shape of a frequency distribution, except that this cartoon also
represents a mathematical function that can predict any probability.
Later in this course, you will learn how to use a probability distribution to describe a
frequency distribution. For now, let’s review some common probability distributions.
A. Normal Probability Distribution
—This distribution, often called a bell curve, has a
single, central mode and a symmetrical tail on each side. The mode is the most
probable value.
B. Bimodal Probability Distribution
—This distribution has two modes, a lower mode
and an upper mode. Both modes may be equally probable.
C. Skewed Probability Distribution
—This distribution has a single mode that is
shifted to either the left or the right, leaving a long tail on the opposite side. The
mode is the most probable value.
D. Uniform Probability Distribution
—This distribution is a flat line, such that all
values are equally probable. This distribution has no unique mode.
The plots below (A-D) show examples of the four types of probability distributions.
Directions
: Use the frequency distributions that you plotted in Step 2 (questions 3-4)
to answer questions 17-20.
17. Which of the probability functions best matches the shape of the frequency
distribution of cholesterol concentration in
people between the ages of 20 and
44 years
?
a.
normal distribution
b.
bimodal distribution
c.
skewed distribution
d.
uniform distribution
18. Explain your answer to the previous question. Be sure to discuss features of the
frequency distribution that caused you to choose a certain probability distribution.
The bars on my graph started high and then leveled o
ff
.
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19. Which of the probability functions best matches the shape of the frequency
distribution of cholesterol concentration in
people between the ages of 45 and
64 years
?
a.
normal distribution
b.
bimodal distribution
c.
skewed distribution
d.
uniform distribution
20.Explain your answer to the previous question. Be sure to discuss features of the
frequency distribution that caused you to choose a certain probability distribution.
The bars on my graph started level then high then level again.
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