The average heights of four samples taken from a population of students are shown in the table. Which of these is most likely closest to the average height
of the population?
Sample size
10
20
30
40
Average helght
(Inches)
63
54
57
59

O A. 63
O B. 57
O c. 54
OD. 59

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