Unformatted text preview: ime reading fancy
fonts. More than 200,000 people took GMAT test. Normal scores
with mean u 525 and st dev 100. 100 students go through training
program to raise GMAT. If the students avg score is xˉ=541.4
perform significance test to determine if program improves
scores. P= .0505. When xˉ=541.5 p= .049. based on a α=.05 we
reject the p value of .0505 but accept .049. this shows that a
change in .1 pts of GMAT can make a statistical difference but
such a small increase has little practical importance. Even if a
statistical test shows mean value is higher or lower than a
specified value, doesn’t tell us real world importance. Ex: if there
is significant evidence that the mean price of gas in town is .01
cheaper than price down the road I might drive into town to fill
up, however if town is 15miles away, not practically important to
make trip to save money....
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This note was uploaded on 08/27/2013 for the course STATISTICS AP Statist taught by Professor Salas during the Fall '12 term at Alhambra Senior High.
 Fall '12
 Salas
 Statistics, AP Statistics

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