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Unformatted text preview: old scores 8 points The 9
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old scores 12 points The 38
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old scores 18 points Mean = 0 Standard deviaIon = 1 Sum of a set of Z
scores is always zero Why? The mean has been subtracted from each score. Following the deﬁniIon of the mean as a balancing point, the sum (and average) of all deviaIon scores must equal 0. Z score someImes called “standard” score The distribuIon of a set of standardized scores has the same shape as the unstandardized scores Beware of the “normalizaIon” misinterpretaIon 10 9/9/13 Josh and Joanna, two kids in a family, both seem to be overweight. Their mom only has enough money for one of them to enroll in a special weight loss program. Help the mom decide who is the heaviest for his/her age. Josh weighs 145 lbs For boys his age, M = 120, SD = 20
Joanna weighs 130 lbs For girls her age, M = 115, SD = 16 To foster compeIIon, a dad decides to give $50 to whichever of his sons does beSer in math. Who should get more money? Younger brother (in 7th grade) scores 82 M = 76, SD = 12 Older brother (in 9th grade) scores 81 M = 76, SD = 10 A person scores an 81 on a test of verbal ability and 6.4 on a test of quanItaIve ability. For the...
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This note was uploaded on 03/24/2014 for the course PSY 21201 taught by Professor Bernard during the Winter '13 term at SUNY Stony Brook.
 Winter '13
 bernard
 Psychology

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