Stat 200: Introduction to Statistics Final Examination Answers

STAT 200: Introduction to Statistics Final Examination Answers
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This is an open-book exam. You may refer to your text and other course materials as you work on the exam, and you may use a calculator. You must complete the exam individually. Neither collaboration nor consultation with others is allowed. It is a violation of the UMUC Academic Dishonesty and Plagiarism policy to use unauthorized materials or work from others.


Answer all 20 questions.   Make sure your answers are as complete as possible.   Show all of your work and reasoning.   In particular, when there are calculations involved, you must show how you come up with your answers with critical work and/or necessary tables.   Answers that come straight from calculators, programs or software packages will not be accepted.   If you need to use software (for example, Excel) and /or online or hand-held calculators to aid in your calculation, you must cite the sources and explain how you get the results.
Record your answers and work on the separate answer sheet provided.


This exam has 200 total points; 10 points for each question.
You must include the Honor Pledge on the title page of your submitted final exam. Exams submitted without the Honor Pledge will not be accepted.


1.
True or False. Justify for full credit.


(a)   The standard deviation of a data set cannot be negative.
(b) If P(A) = 0.4 , P(B) = 0.5, and A and B are disjoint, then P(A AND B) = 0.2.
(c)   The mean is always equal to the median for a normal distribution.
(d) A 95% confidence interval is wider than a 98% confidence interval of the same parameter.
(e)   In a two-tailed test, the value of the test statistic is 1.5. If we...