Question

ch 8* a state representative wants to know how voters in his district feel about enacting a statewide smoking ban in all enclosed public places, including bars and restaurants, as well as several other current statewide issues. he mails a questionnaire addressing these issues to an srs of 800 voters in his district. of the 800 questionnaires mailed, 152 were returned. the sample is
the 152 voters returning the questionnaire.
the 800 voters receiving the questionnaire.
all voters in his district.

question 5
1 pts
ch 8 a study where investigators observe subjects and measure variables of interest without assigning treatments to the subjects is called
observational study
experiment
simple study

Explanation:

First Question (About the Sample)

To determine the sample, we recall that a sample is the subset of the population from which data is actually collected. Here, the state representative mailed questionnaires to 800 voters (the sampling frame), but only 152 returned them. The sample consists of the individuals from whom we get responses (the data), so it's the 152 voters who returned the questionnaire. The 800 voters receiving the questionnaire are the sampling frame (not all responded), and all voters in the district are the population.

An observational study is defined as a study where researchers observe subjects and measure variables of interest without intervening (assigning treatments). An experiment involves assigning treatments to subjects to see the effect. "Simple study" is not a standard term for this distinction. So the correct term is observational study.

Answer:

the 152 voters returning the questionnaire.

Second Question (Type of Study)