Stat 231 Exam 3 F11

Stat 231 Exam 3 F11 - Stat 231 Exam 3 Fall 2011 I have...

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1 Stat 231 Exam 3 Fall 2011 I have neither given nor received unauthorized assistance on this exam. ________________________________________________________ Name Signed Date _________________________________________________________ Name Printed
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2 This exam concerns the analysis of some data collected by the Norwegian Public Roads Administration (part of the " NO2 " data set available from the " statlib " data sets archive, submitted to the archive by Magne Aldrin) concerning how air pollution at a road is related to traffic volume, and time-related and meteorological variables. The response variable is 2 hourly values of the logarithm of the concentration of NO particles y measured at Alnabru in Oslo, Norway, between October 2001 and August 2003. The predictor variables in the original data set were  1 2 3 4 5 logarithm of the number of cars per hour temperature 2m above ground ( C) wind speed m / s temperature difference between 25m and 2m above ground ( C) wind direction (in degrees between 0 and x x x x x  6 7 360) hour of day (from 0 to 24) day number from October 1, 2001 x x Vardeman also added predictors to the data set by defining the variables 55667 7 22222 2 sin ,cos ,sin , and cos 360 360 24 24 365 365 x xx x     Here are the sample correlations between the variables in this problem. a) What single predictor will produce the largest value of 2 R for a simple linear regression analysis of y ? Explain.
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This note was uploaded on 02/11/2012 for the course STAT 231 taught by Professor Staff during the Fall '08 term at Iowa State.

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Stat 231 Exam 3 F11 - Stat 231 Exam 3 Fall 2011 I have...

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