Exam 11: Sample Surveys

At the end of each semester a local university requires a professor's evaluation.An evaluation survey is given to each student to fill out.Identify the type of sampling used in this example.

The human resources department of a large,well-known telecommunications firm is behind schedule in sampling the job satisfaction of the company's employees.In an effort to catch-up,the HR manager quickly goes down an alphabetical list of employees and e-mails a survey to every tenth employee.An neutral third party collects all surveys and ensures all of the selected employees respond to the survey.What sampling method best describes what the HR manager is doing?

The human resources department of a large,well-known telecommunications firm would like to know the job satisfaction of the employees working at its company.This HR department hires an outside,impartial consultant to sample its management and its non-management employees separately.For this scenario,what is the best sampling method to use?

A magazine publisher wants to create a new regionalized version of its national magazine for the west coast.The publisher sends a survey to some of its west-coast subscribers chosen at random regarding interest for this new version of its national magazine.A list of all of the west-coast subscribers who receive the national magazine and may or may not have been chosen for this survey are known as what?

A newly-premiered play just ended that evening at a local theatre.Theatre management briefly interviews every eighth person leaving the theatre to see if that person will recommend the play at that theatre to other people.Identify the type of sampling used in this example.

A magazine publisher will mail a survey to 14% of its subscribers that will be chosen at random.The survey asks about the quality of its subscription service.A list of all subscribers represents what?

The human resources department of a large,well-known telecommunications firm is behind schedule in writing a report about the job satisfaction of the company's employees.In an effort to quickly sample some people,the HR manager orders his subordinates to give out paper surveys "to anyone you see sitting at their desk",and the survey,completed or not,will be picked up in five minutes.Only the completed surveys will be used in the report.What sampling method best describes what this HR manager is doing?

A magazine publisher mails a survey to every subscriber asking about the quality of its subscription service.The total number of subscribers represents what?

George,a network engineer,ordered 600 CAT 5e Ethernet cables for use at his company's network.After receiving these cables,he decided to randomly test 180 of these cables before using them.He was alarmed to find out that 83% of these cables failed completely.He returned the entire lot to the manufacturer.When he tested the cables,what was George's sample size?

A blockbuster movie had just premiered on exactly 1,257 screens throughout the country.Within the first week,a few theatres were chosen at random,and then theater management interviewed approximately 5% of the theatregoers at those selected theatres.All these theatregoers loved the movie,therefore management decided to increase the number of showings per week.Identify the type of sampling used in this example.

Jennifer is a quality control inspector for a well-known computer modem manufacturer.Jennifer oversees five assembly lines,each assembly line produces the same number of modems per day.Jennifer randomly selects one assembly line each morning and performs further sampling and quality control procedures on that assembly line's modems for the rest of the day.This morning,Jennifer randomly selected the modems of assembly line #5 for quality control inspection.Futhermore,Jennifer will then perform systematic sampling on that assembly line's modems.What has been excluded from being in the sampling frame today?

A computer network manager wants to test the reliability of some new and expensive fiber-optic Ethernet cables that the computer department just received.The computer department received 10 boxes containing 20 cables each.The manager does not have the time to test every cable in each box.The manager will choose one box at random and test 4 cables chosen randomly within that box.What is the sampling frame?

A magazine publisher always mails out a questionnaire five months before a subscription ends.This questionnaire asks its subscribers if they are going to renew their subscriptions.On average,only 3% of the subscribers respond to the questionnaire.Of the 3% who do respond,an average of 44% say that they will renew their subscription.The value 44% is known as what?

The spell-checker in a desktop publishing application may not catch all misspellings (e.g.their,there)or correctly interpret the spellings of proper names.Jackie is an expert editor and can proofread extremely quickly.Jackie is hired by a book publisher to check the spelling of every word in the latest proof of a history book.With regard to Jackie's assignment,what is the population?

The human resources manager of a large,well-known telecommunications firm is genuinely concerned about the well-being of the company's employees.This HR manager will e-mail everyone within the company asking for suggestions in improving the health of employees working there.The manager will list specific problems that may affect an employee,including weight,smoking,and stress.For this scenario,what sampling method is being used?

A magazine publisher always mails out a questionnaire four months before a subscription ends.This questionnaire asks its subscribers if they are going to renew their subscriptions.On average,only 9% of the subscribers respond to the questionnaire.Of the 9% who do respond,an average of 49% say that they will renew their subscription.This 9% who respond to the questionnaire are known as what?

A magazine publisher mails a survey to every subscriber asking about the quality of its subscription service.Mailing a survey to every subscriber represents what?

Geologists have an interest in the structure and the history of the earth.A geologist can go back in time by drilling deep into the ground,retrieving a core sample,estimating the ages of the various layers,and examining the composition.A timeline can be built of the entire area from where the core sample was drilled.A geologist may retrieve several core samples to confirm the history of the earth's structure in that sampled area.Mountains,lakes,and unstable ground can easily impede a simple random sampling of a desired geographical area,therefore what is the most realistic sampling method that represents the actual drillings,comparisons,and scientific examinations of several core samples within the same geographical area?

An education researcher randomly selects 38 schools from one school district and interviews all the teachers at each of the 38 schools.Identify the type of sampling used in this example.

At a small college there are 120 freshmen,90 sophomores,110 juniors,and 80 seniors.A school administrator selects a random sample of 12 of the freshmen,a random sample of 9 of the sophomores,a random sample of 11 of the juniors,and a random sample of 8 of the seniors.She then interviews all the students selected.Identify the type of sampling used in this example.