For a repeated-measures design, the differences between treatments may be caused by a treatment effect or by sampling error (random factors), but they cannot be caused by individual differences

The abbreviation STI stands for:

a) standard transmission of illness. b) sinful transmission of iatrogenesis. c) socially transmitted ilk. d) sexually transmitted infection.

When people are asked to rate the attractiveness of faces, the faces that they most prefer

a. have the fewest blemishes. b. most resemble those of their current romantic partners. c. most differ from their own. d. most resemble their own.