Aswim team consists of 7 boys and 6 girls. a relay team of 4 swimmers is chosen at random from the team members. what is the probability that there are 2 boys on the relay team given that there are 2 girls on the relay team? express your answer as a fraction in lowest terms or a decimal rounded to the nearest millionth.

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect