Exam 5: Data Collection and Sampling

Give three important points to consider when designing a questionnaire.

Self-administered surveys usually have a high response rate.

Soft Drinks ​ A soft drink manufacturer has been supplying its products in bottles to grocery stores and in cans to small convenience stores.The company is analyzing sales of this product to determine which type of packaging is preferred by customers. ​ ​ -{Soft Drink Narrative} Is this study observational or experimental? Explain.

____________________ error results from the failure to collect data from all subjects in the sample.

Give an example of a poll that involves a self-selected sample.

A researcher conducts a study where she divides subjects into two groups,gives each group a certain treatment, and records their responses.What type of data collection is being used here?

____________________ sampling is particularly useful when it is difficult or costly to develop a complete list of the population members.

Which of the following situations lends itself to cluster samples?

Excluding some members of the target population results in ____________________ bias.

Smoking and Heart Attacks ​ A medical researcher is interested in investigating the relationship between smoking and heart attacks ​ ​ -{Smoking and Heart Attacks Narrative} How can you show that smoking causes heart attacks without being able to do a designed experiment?

Proper interviewer training helps to reduce ____________________ error.

The larger the sample size is,the more accurate we can expect our sample estimates to be.

Which method of data collection is involved when a researcher counts and records the number of students wearing backpacks on campus in a given day?

The Admissions Officer from a large university mailed a survey to 600 students selected at random.The sample was designed to include 150 students randomly selected from each of the freshman,sophomore,junior,and senior classes on campus.What sampling method was used?

A self-selected sample is one in which the individuals choose themselves to be in the sample.

To reduce sampling error,minimize the chance for bias to occur during sampling.

The ____________________ rate is the proportion of people in the sample who completed the survey.

An experiment involves collecting data about persons or objects by deliberately exposing them to some kind of change and comparing the results.

Which of the following describes selection bias?

Pollsters want to know what percentage of all registered voters in Missoula,Montana,intend to vote in the next election.They visit with 350 people at the downtown shopping mall during one afternoon and ask each person whether or not they intend to vote.Are the target population and the sampled population the same in this case? Explain.