ECn221 Studyguide1

# ECn221 Studyguide1 - Question #1 (a) Describe a standard...

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Question #1 (a) Describe a standard normal distribution. ____________________________________ (b) The mean of the standard normal distribution is _____ and the variance is _____ (c) What is sensitivity? __________________________________________________ (d) What is the p-value? ____________________________________________________ (e) What is a binary variable? ______________________________________________ (f)  What is the mean of a binary variable called? ______________________________ (g) A value that tells about the number of standard deviation a value is from the mean is  called ______________ (h)  Why the variance often is passed over as a measure of spread?  _________________________________________________________________________ (i)  What is meant by the standard deviation is unknown? _______________________ (j) What is difference between a probability and a non-probability sample  _______________________________________________________________________ (k)  Write a short scenario on your job where you will deal with a stratified random sample.  PLEASE WRITE CLEARLY  (l)  What is the advantage of cluster over simple random sampling?  ________________________________________________________________________ (m)  What is the disadvantage of stratified over simple random sampling?  ________________________________________________________________________

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## This test prep was uploaded on 04/05/2008 for the course ECN 221 taught by Professor Roberts during the Spring '07 term at ASU.

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ECn221 Studyguide1 - Question #1 (a) Describe a standard...

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