In the past, people with large head circumferences were viewed as intelligent, and people with smaller head circumferences were considered less intelligent. This is an example of a(n) ___________ correlation

In a double-blind experiment:

A) the researcher conducting the posttreatment assessment does not know which participants were given the treatment and which had been assigned to a wait-list control. B) the researchers conducting the treatment send their data to an impartial laboratory for analysis; they are kept blind as to the results of the study until publication. C) both the experimenter and the participant are uninformed about which treatment the participant is receiving. D) participants never know if they were given the treatment or not.

For a one-way within-subjects ANOVA, the mean difference attributed to the manipulation is measured as variability ______, the mean difference attributed to individual differences is measured as variability ______.

A. between-groups; within-groups B. between-groups; between-persons C. within-groups; between-groups D. between-persons; within-persons