asmi
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a study was conducted to determine IQ scores and admission into a society. only persons with IQ scores atleast 2 Standard deviations above mean on WAIS scale are elgible for admission.Of a group of 200 people randomly selected from population , how many wold be eligible for membership to society ?
plz explain your answer !
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| Colombia
Forum Guru
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190 :?:
2 SD =95% according Gausse
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| asmi
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no...
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| Colombia
Forum Guru
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80 :?:
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| asmi
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answer is : 5
95% of normally distributed population falls between -/+ 1.96 S.D. from mean
2.5% of population will have IQ above 2 SD or more above mean
2.5% ....................................2 SD below the mean
2.5% of 200 people= 5
:roll: this is the answer but i didn't and i think i can never understand this stupid SD problems...i really need to work hard on biostatistics .
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| usmleasr
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good q asmi...we have to remember the values of std curve on one side alone too.. 
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| mjl1717
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In playing with numbers this q may have been easier just using the #100 people, then doubling one side of the mean past approximately 95%.
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| peekay
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aquestion is about people who are above two SDs.so as every one know 95 % fall with in two +/- SDs and 5% out side that is 2.5 %C on posiitive side and 2.5% on negative side.so if they are sking above mean it means towards positive side so for 200 people it would be 5 (2.5 +2.5)
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| Quinn
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Nice question asmi....I get it!
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