A Senator wants to know what the voters of his state think of proposed legislation on gun control. He mails a questionnaire on the subject to an SRS of 2500 voters in his state. His staff reports that 448 questionnaires have been returned, 343 of which support the legislation. The population is the voters in his state, the 448 letters received, the 343 letters supporting the legislation, the 2500 voters receiving the questionnaire.
The sample is the voters in his state, the 448 letters received, the 343 letters supporting the legislation, the 2500 voters receiving the questionnaire.
This is an example of a survey containing nonresponse. a survey with little bias because a large SRS was used. a survey with little bias because it was the voters who elected the senator. all of the above.
At a local health club, a researcher samples 75 people whose primary exercise is cardiovascular and 75 people whose primary exercise is strength training. The researcher's objective is to assess the effect of type of exercise on cholesterol. Each subject reported to a clinic to have their cholesterol measured. The subjects were unaware of the purpose of the study, and the technician measuring the cholesterol was not aware of the subject's type of exercise This is an observational study. an experiment, but not a double blind experiment a double blind experiment. a matched pairs experiment