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Math 127B, Quiz 4 Solutions
Thursday, February 17th, 2011
Name:
Recitation Section:
Ten minutes. Calculators allowed. 20 points maximum.
1. Some information from the CPS is shown below. Based on this compute the unemployment rate. [
10
points]
Civilian noninstitutional population
236.8
Labor Force
153.0
Employed
136.8
Not in Labor force
83.8
Figure 1: Current population survey, January 2010. Figures in millions.
Solution
unemployment rate =
153
.
0

136
.
8
153
.
0
= 10
.
6%
.
2. In a certain month the CPS collects information on 100,000 housing units. The sample is divided in
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Unformatted text preview: half, and each half is used to predict the size of the civilian labor force. The numbers are 150.7 million and 151 million. Based on this information, provide an estimate for the size of the civilian labor force and a standard error. [ 10 points] Solution Use the halfsample method. The average is 150 . 7+151 2 = 150 . 85. The SE is given by 151150 . 85 = 0 . 15. The estimate is 150.85 million give or take 0.15 million. 1...
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This document was uploaded on 10/29/2011 for the course MATH 127B at Vanderbilt.
 Spring '11
 Staff
 Math, Statistics

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