You decide to send a survey 3215 registered voters who are 25 to 45 years old and live in Central City and ask whether or not they have decided who they are voting for. Answer the following question concerning your study:

A. What is the population in the study?

B. What is the sample in the study?

C. When calculating the standard deviation for a population versus for a sample, why-in

your own words - are the formulae different?

You know education is a top priority for politicians in Central City and while preparing your survey, you read an article in the Jeffersonian Times that local researchers wanted to determine if there is a relationship between high school GPA and a student having a television in their bedroom.

The researchers look at 101, 423 high school students and asked them whether or not they had a television in their bedroom. They then determined the GPA for each student. They concluded that not having a television in the bedroom is associated with an increase in high school GPA. Answer the following questions about the researchers' study:

A. What type of observational student is this?Why?

B. What are the explanatory and response variables? Are they quantitative or qualitative?

C. Are there any confounding factors that should be considered that may after the response

variable?

You have heard from colleagues who have worked in the state of Jefferson for a number of years that the local population are notorious for not answering surveys, which has been a major hinderance for previous political consultants in Central City. Since you do not wish for this to happen with your survey, what are potential solutions to prevent non-response bias?