Exam 5: Data Collection and Sampling

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.

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?

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

A self-selected sample represents the sampled population but not the target population.

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

Nonresponse error occurs when someone was not selected to participate in the survey.

Messenger Service Three messenger services deliver to a small town in Oregon.Service A has 60% of all the scheduled deliveries,service B has 30%,and service C has the remaining 10%.Their on-time rates are 80%,60%,and 40% respectively.Define event O as a service delivers a package on time. -In designing a survey,demographic questions must be avoided.

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

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.

Nonresponse error occurs when responses are not obtained from some members of the sample.

"Wouldn't you agree that foreign cars are better than American cars?" is an example of a well-worded survey question.

Which of the following types of samples should not be used to make good statistical inferences from a sample to a population?

A self-selected sample is the group of individuals who were randomly selected to be in the sample,then agreed to participate in the study.

The response rate of a survey is the proportion of all people who were selected but did not complete the survey.

When the population is divided into mutually exclusive sets,and then a simple random sample is drawn from each set,this is called:

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