A sociologist wants to know the opinions of students about online education. He obtains a list of 825 students who have recently completed an online course and mails a questionnaire to a randomly selected group of 150 of these students. Only 67 of the questionnaires are returned. Identify the population and the sample in this study. (4 points) The population is 825 and the sample is 67.
The population is 150 and the sample is 67.
The population is 825 and the sample is 150.
The population is 67 and the sample is 825.
The population is 150 and the sample is 825.

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