Percentile transformations change the relationship between scores such that scores
a) near the center of the distribution differ substantially in their percentile ranks
b) near the center of the distribution are similar in their percentile ranks
c) at the extremes of the distribution differ substantially in their percentile ranks
d) throughout the same distribution have equivalent percentile ranks
Question 2
The item-total correlation is a statistic that gives information on
a) item difficulty
b) item discrimination
c) item distraction
d) item complexity
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How to describe transformations of a sinusoidal function (y=a*sinb(x−c)+d)
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