ECN221 Studyguide

# ECN221 Studyguide - Spring 2008 ECN221 Exam II Sample...

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Spring 2008 ECN221 Exam II Sample Questions Name _____________________________________________ ID No. (not social security number) _____________________________________ 1. Do all questions. 2. Use the space provided for the worked out problems. 3. Only write what the question requests. 4. In question#1, if part of your answer is incorrect the entire answer is wrong. 5. SPSS outputs are provided. 6. It is your responsibility to make sure you have all 10 pages. 7. The color of your output must agree with the color of your exam.

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Question #1 (a) The margin of error is _____________________________________________________ (b)What is the difference between the standard deviation and the standard error? (c)What is the power of a test? (d) Describe a standard normal distribution. ____________________________________ (e) The mean of the standard normal distribution is _____ and the variance is _____ (f) What is the probability of a type I error called? _______________________________ (g) What is the probability of the type II error? _________________________________ (h) What is sensitivity? __________________________________________________ (i) What is the p-value? ____________________________________________________ (j) What is a binary variable? ______________________________________________ (k) What is the mean of a binary variable called? ______________________________ (l) A value that tells about the number of standard deviation a value is from the mean is called ______________ (m) Why the variance often is passed over as a measure of spread? _________________________________________________________________________ (n) What is meant by the standard deviation is unknown? _______________________ (o) Explain why we do not find confidence intervals for a sample mean? ________________________________________________________________________ (p)What is difference between a probability and a non-probability sample _______________________________________________________________________ (q) Write a short scenario on your job where you will deal with a stratified random sample. PLEASE WRITE CLEARLY 2
(r) What is the advantage of cluster over simple random sampling? ________________________________________________________________________ (s) What is the disadvantage of stratified over simple random sampling? ________________________________________________________________________ (t) What is the disadvantage of cluster over simple random sampling? ________________________________________________________________________ (u)

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ECN221 Studyguide - Spring 2008 ECN221 Exam II Sample...

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