Stat 231 Exam 2 Key F11

Stat 231 Exam 2 Key F11 - Stat 231 Exam 2 Fall 2011 I have...

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1 Stat 231 Exam 2 Fall 2011 I have neither given nor received unauthorized assistance on this exam. ________________________________________________________ Name Signed Date _________________________________________________________ Name Printed
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2 1. Thicknesses of 6 n sheets of wallboard before and after drying during manufacture, corresponding differences, and some summary statistics are below. (Units are inches.) Board Before ( x )A f t e r ( y ) Difference ( d ) 1 .514 .510 .004 2 .505 .502 .003 3 .500 .493 .007 4 .490 .486 .004 5 .503 .497 .006 6 .500 .494 .006 mean .5020 .4970 .0050 std dev .0078 .0082 .0015 a) What 6 ordered pairs would be plotted on ordinary graph paper to make a normal plot for the "Before" data? (List the 6 numerical ordered pairs.) b) With .05 , is there sufficient evidence to force the conclusion that drying provides a consistent reduction in thickness? (Show the whole 7 format.) 7 pts 13 pts
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3 c) Give 95% two-sided confidence limits for the mean "After" thickness of these sheets of wallboard. (Plug in completely, but you don't need to simplify.) d) Give a 90% upper confidence bound for the standard deviation of "After" thicknesses of these sheets of wallboard. (Plug in completely, but you don't need to simplify.) e)
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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 2 Key F11 - Stat 231 Exam 2 Fall 2011 I have...

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