Stat 231 Exam 3 S10 Key

Stat 231 Exam 3 S10 Key - Stat 231 Exam 3 Spring 2010 I...

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1 Stat 231 Exam 3 Spring 2010 I have neither given nor received unauthorized assistance on this exam. ________________________________________________________ Name Signed Date _________________________________________________________ Name Printed
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2 This exam concerns analyses of some data collected by ISU students Flood and Shankwitz in a study of tempering (heat treating) of a particular grade of stainless steel. 48 slugs of this material were pre-processed to a fairly uniform hardness, and then tempered at various combinations of time 1 x (in minutes) and temperature 2 x (in F ). (3 slugs were tested at each of the 16 combinations of 1 5,50,150, and 500 x and 2 800,900,1000, and 1100 x .) The response y recorded by the students was the increase in Brinell hardness as a result of tempering. One might consider expressing time on a log scale. Below are plots of the 16 time-temperature combinations the students employed, with 1 x on the both the original and log scales. The first few lines of the JMP data table are as below.
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3 And here is some information on a variety of fits made to these data using the Fit Model routine in its " Stepwise " mode.
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Stat 231 Exam 3 S10 Key - Stat 231 Exam 3 Spring 2010 I...

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