Researchers conducting web-based research have trouble controlling who actually answers their on-line questionnaires, which places limits on their research due to the possibility of

Which of the following statements is true?

a) Infants as young as 3 months show a gender-based preference for looking at either trucks (boys) or dolls (girls). b) Boys and girls show no difference in toy preference (dolls or trucks) until about age 4. c) Children have to be explicitly taught which toys to prefer, dolls for girls and trucks for boys. d) Until age two, boys and girls both prefer dolls over trucks to play with.

Correlation does not imply causation. We know this because two main drawbacks of correlation studies are

a. poor correlation coefficients and alpha rankings. b. third variable problem and directionality. c. magnitude and direction of the correlation. d. moderate association and fictional dependence.