The chance that it will rain in a town where a family is spending vacation is 60% for each of 3 days. a spinner is used to simulate the weather pattern over the 3 day period. there are 5 equal sized sections. 3 sections are labeled R for rain and 2 are labeled N for no rain. what is the experimental probability that it will rain exactly 1 out of the 3 days? (r, n,r) (n, n,r) (r, r,r) (n, r,r) (n, r,n) (r, r,n) (n, r,n) (r, n,r)

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