A box contains 4 red marbles, 3 green marbles and 2 blue marbles. One marble is removed from the box and then replaced. Another marble is
drawn from the box. What is the probability that the first marble is blue and
the second marble is green?

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