In general, when designing studies, researchers hope to __________ systematic variance based on the independent variable, and __________ error variance

Some researchers suggest that the increase in the number of children suffering from asthma over the last two decades is caused by

a. a greater number of children getting better health care. b. more children receiving their immunizations. c. weather-proofed new buildings. d. government mandates to reduce smog.

What name did "Brenda" take after it was revealed that "she" was born male?

a. John b. Bruce c. Brian d. David