________ is the best available predictor of infant survival and healthy development.

___________is not one of the chronic stressors cited in this text.

Fill in the blank(s) with the appropriate word(s).

You hypothesize that low social class causes poor school grades. You find that the correlation between low social class and school grades is .01 ) What can you conclude?

a) Your hypothesis may be correct, but longitudinal research is indicated to reach a firm conclusion. b) Your hypothesis is probably incorrect. c) Your hypothesis has not been tested, because a correlational study cannot answer questions about cause and effect. d) It is probably poor school grades that lead to low social class.