Exam 10: Sample Surveys

One day a popular morning show on a local radio station conducted a phone-in survey regarding the recent rise in the city's various utility rates.The survey lasted the entire morning show.Other than time constraints of the show,no callers were knowingly refused to voice their opinion on-air.The transcribed results were sent to various governmental agencies and local politicians.Identify the type of sampling used.

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.The HR department's goal is to have every employee participate in this survey.For this scenario,what sampling method best fits HR's goal?

Inside the boxes of a new brand of cereal,is a short survey that can be mailed back for free to the manufacturer.The survey asks the consumer if he or she likes the cereal or not.What,if any,will be the most noticeable bias for this survey?

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?

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,but the HR department is restricted by company policy to use only email to distribute and collect any type of employee questionnaire or survey.What sampling method is HR being forced to rely upon?

Management at a particular post office wants to know about the quality of its face-to-face service at its customer service windows.For one week,the post office will ask the customers directly.After a customer is helped,a different employee asks the customer a short question about his or her customer service experience.The customer's comments are then transcribed by a secretary.This survey runs smoothly and a lot of customer comments are collected.What,if any,is the most noticeable bias for this survey regarding customer service at this post office for that week?

A Statistics instructor wishes to know the average age (in month)of his 200 students.He is too lazy to sample all 200 students so he decides to choose 20 students at random from the class and ask them for their age.He orders all students alphabetically by their first name.He then selects every 10th person on the list to be in his sample.This sampling method is called a

A Statistics instructor wishes to know the average age (in month)of his 200 students.He is too lazy to sample all 200 students so he decides to collect the ages for the first 20 students to yell out their ages.This sampling method is called a

A non-for-profit consumer agency wanted to investigate the economic and humanitarian contribution of this country's pharmaceutical companies by sampling large companies and businesses of all types.It was decided to sample the pharmaceutical companies first.After surveying the pharmaceutical companies,someone at the consumer agency wanted to distribute the data early.What,if any,will be the most noticeable bias in distributing the survey at this point in time?

A newspaper conducted a random telephone survey during the day regarding the percentage of stay-at-home moms and dads in the typical household.What,if any,will be the most noticeable bias for this survey?

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.In this example,"231" is known as what?

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 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.A 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?

A mega-discount chain store just opened a new clothing store in town emphasizing mainly women's clothing.Before opening,management had to decide whether to only carry either men's,women's,boys',girls',or infants' clothing.After performing representative sampling of potential customers from each of these groups,it was decided to carry only women's clothing.Identify the type of sampling used in this example.

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 group of 200 students is known as what?

Several watch-dog consumer groups have criticized the fast food industry for serving food with excessive fat content.One watch-dog announced that it will randomly select one fast food chain per week.The watch-dog will then decide,as a group,to purchase one item off the menu that has been advertised the most on television and in the newspapers.The watch-dog will then have that heavily-advertised,just-purchased item professionally sampled for fat content.Weekly results will be posted on the watch-dog's website.For this scenario,what best describes the watch-dog's sampling activities each week?

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?

Before premiering a blockbuster movie at a theatre,test screenings are done beforehand.A small number of selected theatres are chosen geographically throughout the country.Each theatre chosen is supposed to be representative of theatregoers in that area.Everyone is interviewed when the movie is over.Identify the type of sampling used in this example.

A Statistics instructor wishes to know the average age (in month)of his 200 students.He is too lazy to sample all 200 students so he decides to choose 20 students at random 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).This sampling method is called a

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.In this example,"25" is known as what?