For a research study with 2 levels of factor A, 3 levels of factor B, and n = 5 in each treatment condition, what are the df values for the F-ratio evaluating the main effect for factor A?

Everyone would agree that intelliegence tests are "biased" in the sense that:

A. test performance is influenced by cultural experiences B. the reliability of intelligence tests is close to zero C. the heritability of intelligence is very high D. numerical scores of intelligence serve to dehumanize individuals

What method is used to test fetal cells to determine whether the fetus has any genetic defects?

a) ultrasound b) amniocentesis c) genetic screening d) chromosomal mapping