Test Your Nutrition Iq
Posted in Health and Nutrition on 05/28/2008 11:44 am by Steven NerenbergPlease help if you’re good at statistics! When the Stanford-Binet “IQ test” came into use in 1932, it was….?
Please SHOW YOUR WORK!! I don’t get this problem and i want to actually know how to do it!!
When the Stanford-Binet “IQ test” came into use in 1932, it was adjusted so that scores for each age group of children followed roughly the normal distribution with mean µ=100 and standard deviation σ=15. The test is readjusted from time to time to keep the mean at 100. If present day American children took the 1932 Stanford-Binet test, their mean score would be about 120. The reasons for the increase in IQ over time are not known but probably include better childhood nutrition and more experience in taking tests.
a) IQ scores above 130 are often called “very superior.” What percent of children had very superior scores in 1932.
b) If present day children took the 1932 test, what percent would have very superior score? (Assume that the standard deviation σ=15 doesn’t change.)
qa
1932 z-value = (130 – 100) / 15 = + 2
looking up table,
% of children with very superior scores
= 2.02%
qb
present day z- value = (130 – 120) / 15 = + 0.67
looking up table,
% of children with very superior scores
= 25.14%
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