Alan and Alissa and attemping to find each other in a crowded mall. They finally spot each other near the food court, at which point they are 140 feet apart. They begin walking towards each other. Alan travel at a constant rate of 5 feet per second and Alissa travels at a constant rate of 4 feet per second. What quantities are varying in this context ?

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