Exam 10: Sample Surveys

A magazine publisher is informed that 54% of subscribers last year did not renew their subscriptions.This publisher wants to randomly survey 11% of these past subscribers asking the reason why they did not renew their subscriptions.A list of last year's subscribers who did not renew their subscriptions is known as what?

One way to minimize unanticipated measurement error from poorly worded or confusing questions in a survey is to test your questions on a small sample drawn from the sampling frame.This is known as what?

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.

During a provincial election,a campaign manager wishes to know how well her candidate will do in the upcoming election."Who" should be identified in the sampling frame?

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 7 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 population parameter of interest?

A large university is comprised of several different colleges,institutes,and schools of study.These colleges,institutes,and schools are spread out throughout the city and nearby suburbs.The president of the university is curious about the average cost for a full-time,undergraduate student to attend one semester.All relevant costs to the student will be counted,including tuition,room and board,transportation,books,and so on.Tuition varies greatly within this university,and there are significant population differences among the colleges,institutes,and schools.What would be the most appropriate sampling method to use in order to estimate an average cost of attending this university for one semester?

During the winter season,a prominent newspaper reporter is interested in writing a story about the lack of proper heating of apartment buildings in the city in which he lives.During a particular frigid weekend,this reporter manages to interview almost everyone in his own apartment building.The reporter finds that everyone,including himself,is satisfied with the heating in the apartment building.Identify the type of sampling used in this example.

Mr.Smith works at a computer consultant company that provides technical information to computer departments of various manufacturing companies.Mr.Smith is alarmed at the number of spyware programs on the internet.Mr.Smith attempts to call every one of his clients only to ask (yes or no)if they have had any known problems with spyware infections on their computers or network.With regards to Mr.Smith's attempts to contact his clients for information about infections,what is the population?

A magazine publisher mailed a survey to all of its subscribers asking if the magazine is helpful in their daily lives.Every subscriber responded and 65% replied that the magazine was helpful.The value 65% is known as what?

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 magazine.The publisher wants 100% of the subscribers to respond.This 100% response rate will represent 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 Statistics instructor wishes to know the average age (in month)of his 200 students.He decides to choose 25 students from the class and ask them for their age.All 200 names are put in a hat and 25 names are then chosen at random (without replacement).The average age of the students chosen is observed to be 231 months.The average age of all 200 students is known as what?

A popular soft drink company periodically sets up survey booths in various malls and grocery stores that are chosen at random.The employees working the booths ask interested individuals to fill out a very short survey on the quality of the company's drinks.While filling out the surveys,the individuals are told that a properly completed survey will be rewarded with giveaways,such as free samples,T-shirts,generous coupons,and possibly an appearance in a new television commercial.What,if any,will be the most noticeable bias?

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 8 boxes containing 40 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 8 cables chosen randomly within that box.What is the population?

A cereal manufacturer randomly samples households across the country by telephone.The survey asks the consumer to explain honestly in fifty words or less why he or she likes or dislikes its brand of cereals.It is also stated that for those who participate in this telephone survey,a random drawing will be held for an all-expense paid,two-week cruise.What,if any,will be the most noticeable bias for this survey?

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?

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 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?

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