Many 2-Year-Old Infants Enter a Special Program Because of Their

Multiple Choice

Many 2-year-old infants enter a special program because of their very low IQ scores.Five years later,most of them have improved.Perhaps the program helped.What is another explanation?

A) On average, 7-year-olds have higher IQs than 2-year-olds.
B) Their scores increased because of the Flynn effect.
C) The IQ test for 7-year-olds is easier than the one for 2-year-olds.
D) Scores fluctuate on tests with low reliability.