If a couple wants to prevent pregnancy and avoid STIs, what is the most reliable choice?

According to the chapter They Don't Look the Same to Meabout homogeneity and heterogeneity biases,

what was the distractor-present condition designed to do? (a) distract the participants from the hypotheses the researchers were testing (b) decrease the cognitive load of the participants (c) increase the cognitive load of the participants (d) keep the cognitive load ofthe participants equivalent to the distractor-absent condition

Factorial designs have the advantage of decreasing error variance in the data, which tends to

a. increase the nonsystematic variance. b. decease the systematic variance. c. increase the statistical power. d. decrease the statistical power.