# Stat 200 Midterm Exam

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Subject
Statistics
School
University of Baltimore
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Stat 200 Midterm Exam
Professor: Dr. Tiffany DePriter
Name________________________________
Instructions:
The midterm exam is worth 100 points. There are 10 problems, each worth 10 points.
Content from weeks 1-4 is covered on the midterm.
This exam is open book and open notes, and you may take as long as you like on it
provided that you submit the exam no later than the due date posted in our course
schedule of the syllabus. You may refer to your textbook, notes, and online classroom
materials, but you may not consult anyone.
You must show all of your work to receive full credit. If a problem does not seem to
Please type your work in your copy of the exam, or if you prefer, create a document
containing your work. Scanned work is also acceptable. Be sure to include your name in
the document.
(tiffany.depriter@faculty.umuc.edu).
Please remember to show ALL of your work on every problem. If there is no work to show,
Here are the basic rules of showing work:
a) Each step should show the complete expression or equation rather than a piece of it.
b) Each new step should follow logically from the previous step, following rules of algebra.
c) Each new step should be beneath the previous step.
d) The equal sign, =, should only connect equal numbers or expressions.
At the end of your exam you must include the following dated statement with your name
typed in lieu of a signature. Without this signed statement you will receive a zero.
I have completed this exam myself, working independently and not consulting anyone except
the instructor. I have neither given nor received help on this exam.
Name: Date:

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1.) A doctor wishes to estimate the mean triglyceride level of patients two hours after eating a
steak dinner. To estimate the mean, you collect data from 22 patients. State the individual,
variable, population, sample, parameter, and statistic.
Individual Variable
The triglyceride level of patients two hours after eating a steak dinner.
Population
The total number of patients.
Sample
The 22 patients.
Parameter
Population mean.
Statistic
The sample mean
2.) Explain why the relative frequency column of a frequency table might not sum to 1.0.
In simple term, the column of a frequency table might not sum up to 1.0 for simplicity in using
the decimal expressions. When making calculations, it is easier to record and express the results
in decimal expressions, for example 2 decimal places compared to when many decimal places
are used yet the difference of the calculus is almost insignificant.
3.) The Affordable Care Act created a market place for individuals to purchase health care plans.
In 2014, the premiums for a 27 year old for the bronze level health insurance are given in the
table below. Create a frequency distribution, relative frequency distribution, and cumulative
frequency distribution using 6 classes. (All prices in the table are in dollars \$)
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