Problem
"An analysis of covariance (ANCOVA) was conducted to assess the effect of room type on... racial attitudes at the end of the quarter, controlling for attitudes at the beginning of the quarter. There was a significant effect of room type.... The results supported the contact hypothesis: White freshmen in interracial rooms exhibited significantly more positive racial attitudes at the second session, whereas the racial attitudes of freshmen in same-race rooms did not change..." (p. 721).
• The statistics reported for the study were p < .01, d = .47. Based on these findings, what can you tell me about the study (e.g., is the difference between groups significant or nonsignificant; how big is the effect)?