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Math 1040/1045 With 100% accurate
solutions + rationales 2026
Name _________________________________________
Instructor name
Chapter 4 Midterm Exam
Any calculator is allowed. Necessary tables, formulas, and GeoGebra output are
provided with the exam.
Computers, cell phones and hand-held devices other than calculators are not allowed.
Students may use one 8.5"×11" page of notes, both sides. You may choose to use one of
the provided formula cards, adding your own notes to the page.
Question #1—Choose one of the three options below.
The following data are the price per square foot in dollars of 26 randomly
selected homes sold in the Bryan-College Station, Texas, market.
128 73 83 109 61 72 96 78 67 80 56 143 107
87 135 74 132 115 126 118 74 100 91 88 89 84
i. Create a stem plot for these data. Include a title and a key. (4 points)
ii. What is the shape of the distribution? Circle the one correct answer
below. (2 points) (a) Uniform
(b) Bell-shaped
(c) Right skewed
(d) Left skewed
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The following data are the number of grams of fat in 24 breakfast meals offered
at McDonalds.
12 22 27 3 25 30 32 37 27 31 11 44
21 32 22 46 51 55 47 16 36 30 9 24
i. Create a stem plot for these data. Include a title and a key. (4 points)
ii. What is the shape of the distribution? Circle the one correct answer
below. (2 points) (a) Uniform
(b) Bell-shaped
(c) Right skewed
(d) Left skewed
The following data are the ecological footprints (gha) of 23 randomly selected
countries.
1.1 0.9 6.9 2.1 2.1 1.6 0.6 1.1 2.4 5.7 2.6 1.3
9.5 0.8 8.9 2.9 3.9 1.7 1.8 4.9 0.9 2.2 2.6
i. Create a stem plot for these data. Include a title and a key. (4 points)
ii. What is the shape of the distribution? Circle the one correct answer
below. (2 points) (a) Uniform
(b) Bell-shaped
(c) Right skewed
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(d) Left skewed
Question #2—Choose one of the three options below.
The boxplot below shows salaries for actuaries and CPAs.
James makes the median salary for an actuary. Miguel makes the first quartile
salary for a CPA. How much more money does James make than Miguel? (4
points)
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The boxplot below shows salaries for construction workers and teachers.
Michael makes the first quartile salary for a construction worker. Jennie makes
the third quartile salary for a teacher. How much more money does Jennie
make than Michael? (4 points)
The boxplot below shows salaries for Construction workers and Receptionists.
Thomas makes the third quartile salary for a construction worker. Markos
makes the first quartile salary for a receptionist. How much more money does
Thomas make than Markos? (4 points)
Question #3— Choose one of the three options below.
A 95% confidence interval for the mean commute time to work using a sample
of 50 adult Americans was computed to be between 18.9 min and 29.5 min.
Which of the following would produce a confidence interval that is
NARROWER than the one computed? Circle ALL that apply. (6 points)
(a) Using a 99% confidence level instead of 95%
(b) Using a 90% confidence level instead of 95%
(c) Having a sample with a larger standard deviation
(d) Having a sample with a smaller standard deviation
r more exams
mail’
mail’
Math 1040/1045 With 100% accurate
solutions + rationales 2026
Name _________________________________________
Instructor name
Chapter 4 Midterm Exam
Any calculator is allowed. Necessary tables, formulas, and GeoGebra output are
provided with the exam.
Computers, cell phones and hand-held devices other than calculators are not allowed.
Students may use one 8.5"×11" page of notes, both sides. You may choose to use one of
the provided formula cards, adding your own notes to the page.
Question #1—Choose one of the three options below.
The following data are the price per square foot in dollars of 26 randomly
selected homes sold in the Bryan-College Station, Texas, market.
128 73 83 109 61 72 96 78 67 80 56 143 107
87 135 74 132 115 126 118 74 100 91 88 89 84
i. Create a stem plot for these data. Include a title and a key. (4 points)
ii. What is the shape of the distribution? Circle the one correct answer
below. (2 points) (a) Uniform
(b) Bell-shaped
(c) Right skewed
(d) Left skewed
r more exams
mail’
, r more exams
mail’
The following data are the number of grams of fat in 24 breakfast meals offered
at McDonalds.
12 22 27 3 25 30 32 37 27 31 11 44
21 32 22 46 51 55 47 16 36 30 9 24
i. Create a stem plot for these data. Include a title and a key. (4 points)
ii. What is the shape of the distribution? Circle the one correct answer
below. (2 points) (a) Uniform
(b) Bell-shaped
(c) Right skewed
(d) Left skewed
The following data are the ecological footprints (gha) of 23 randomly selected
countries.
1.1 0.9 6.9 2.1 2.1 1.6 0.6 1.1 2.4 5.7 2.6 1.3
9.5 0.8 8.9 2.9 3.9 1.7 1.8 4.9 0.9 2.2 2.6
i. Create a stem plot for these data. Include a title and a key. (4 points)
ii. What is the shape of the distribution? Circle the one correct answer
below. (2 points) (a) Uniform
(b) Bell-shaped
(c) Right skewed
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(d) Left skewed
Question #2—Choose one of the three options below.
The boxplot below shows salaries for actuaries and CPAs.
James makes the median salary for an actuary. Miguel makes the first quartile
salary for a CPA. How much more money does James make than Miguel? (4
points)
r more exams
mail’
, r more exams
mail’
The boxplot below shows salaries for construction workers and teachers.
Michael makes the first quartile salary for a construction worker. Jennie makes
the third quartile salary for a teacher. How much more money does Jennie
make than Michael? (4 points)
The boxplot below shows salaries for Construction workers and Receptionists.
Thomas makes the third quartile salary for a construction worker. Markos
makes the first quartile salary for a receptionist. How much more money does
Thomas make than Markos? (4 points)
Question #3— Choose one of the three options below.
A 95% confidence interval for the mean commute time to work using a sample
of 50 adult Americans was computed to be between 18.9 min and 29.5 min.
Which of the following would produce a confidence interval that is
NARROWER than the one computed? Circle ALL that apply. (6 points)
(a) Using a 99% confidence level instead of 95%
(b) Using a 90% confidence level instead of 95%
(c) Having a sample with a larger standard deviation
(d) Having a sample with a smaller standard deviation
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