A researcher who is examining the effects of temperature and humidity on the eating behavior of rats uses a factorial experiment comparing three different temperatures (70, 80, and 90) and two humidity conditions (low and high). The experiment has ____ level(s) for the temperature factor and a total of ____ treatment conditions.
a. one; three
b. three; six
c. six; six
d. three; two
Question 2
Wanda is conducting a study of social behaviors among children who are considered to be at high risk because one or both of their parents is in prison. Two observers rate the children's social skills, perform an intervention that consists of structured socialization opportunities, and then rate the children's social skills again. Unfortunately, neither of her original observers are available after the intervention, so she has to use two new observers. As a result, Wanda has a(n) ____ threat.
a. history
b. mortality
c. instrumentation
d. regression
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