Which statement shows that the set of irrational numbers is not closed under multiplication? 1/7(square root of 7) equals square root of 7/7

square root of 5 time square root of 2 equals square root of 10

square root of 3 times 3 equals 3 square root of 3

square root of 2 times square root of 2 equals square root of 4

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