A rotating sprinkler waters the lawn outside the lodge at Oak Tree State
Park. The sprinkler rotates in a full circular path and normally sprays water
over a 4-meter radius. Due to a water main break near the park, the water
pressure decreased slightly and the sprinkler only sprayed water over a 3-
meter radius. How many square meters of lawn were not watered because
of the decrease in water pressure? *

5nt square meters

in square meters
91 square meters
1110 square meters

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