Exam 5: Data Collection and Sampling

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

Give three important points to consider when designing a questionnaire.

A marketing research firm selects a random sample of adults and asks them a list of questions regarding their beverage preferences.What type of data collection is involved here?

Smoking and Heart Attacks A medical researcher is interested in investigating the relationship between smoking and heart attacks -{Smoking and Heart Attacks Narrative} Briefly describe how the researcher might design an observational study to investigate the relationship between smoking and heart attacks

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?

____________________ error refers to differences between the sample and the population.

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} Outline a better method for designing this study, so the same types of stores don't get the same types of packaging.

A simple random sample is chosen in such a fashion that every possible subset of the same size has an equal chance of being selected.

The Chairman of a College of Business with five departments wants to estimate the average number of student-hours lost per month due to illness of their professors.Describe a sampling plan that will help the Dean compare the average student-loss hours for the five departments.

Which of the following types of samples is almost always biased?

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.

Sampling error is the result of a mistake made during the sampling process.

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

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?

What is meant by a self-selected sample? Why are self-selected samples not desirable?

The personnel director at a large company studied the eating habits of the company's employees.The director watched and recorded whether each employee brought his/her own lunch to work, ate at the company cafeteria, or went out to lunch.What method of data collection was used here?

Discuss one advantage and one disadvantage of a self-administered survey as a method of data collection.

Smoking and Heart Attacks A medical researcher is interested in investigating the relationship between smoking and heart attacks -{Smoking and Heart Attacks Narrative} What type of studies are plausible in this particular scenario, observational studies or experiments?

A survey is an example of a(n) ____________________ study.

Briefly describe three types of nonsampling errors.