AP Statistics - SS: Sampling Strategies

An online retailer wishes to survey its customers. The decision is made to select randomly 50 customers who pay with credit cards, 25 customers who pay with debit cards, and 10 customers who pay with checks. This procedure is an example of which type of sampling?

Which of the following is a true statement about sampling?

Sampling error occurs

A town has one high school, which buses students from urban, suburban, and rural communities. Which of the following sampling techniques is most recommended in studying high school students' attitudes toward college versus trade school after high school graduation?

A company wishes to survey what people think about a new product it plans to market. The company decides to sample randomly from their large employee database as this includes phone numbers and addresses. This procedure is an example of which type of sampling?

Each of the 31 National Hockey League teams carries a 20-person roster. A sample of 62 players (10% of all 620 players) will be selected to undergo drug tests. To do this, each team is instructed to put the names of the 20 players into a hat and randomly draw 2 names. Will this method result in a simple random sample of the 620 hockey players?

The United States Tennis Association (USTA) plans to survey 50 of the 1,000 top-rated tennis players in the United States. A list of the players by rank is made available, and a random number between 1 and 20 is picked. The sample consists of the person that number down the list together with every 20th person after that. This procedure is an example of which type of sampling?

A travel agent plans to survey passengers taking the cross-Canada train trip from Vancouver to Toronto. She is considering two sampling methods. Method 1: From a boarding list, randomly choose 15 passengers traveling first class (who have roomettes for sleeping) and 35 passengers traveling coach (who have reclining chairs for sleeping). Method 2: Randomly select one of the cars (each holds 50 passengers), and survey all the passengers in that car. Identify each sampling method.

A polling company conducts a weekly survey to determine the proportion of voters who support the direction Congress is taking. For the coming year, the company decides to double the sample size. The main benefit of this is to

The athletic office at a large university is thinking of allowing women to try out for the baseball team and decides to survey student opinion with a stratified sample based on gender. Which of the following will achieve the desired sampling plan?

To gauge patron use of city libraries, all patrons who check out books from randomly selected libraries will be surveyed. This procedure is an example of which type of sampling?

An IRS agent is given an assignment to choose and audit the tax returns of 260 companies claiming large refunds. She has an assistant list all companies whose name begins with A, assigns each a number, and uses a random number generator to pick 10 of these numbers and thus 10 companies. She proceeds to use the same procedure for each letter of the alphabet and combines the results into a group of 260. Which of the following is a true statement?

A government pollster is planning to survey randomly 50 voters in each of a state's 102 counties regarding a proposed change in the state income tax code. Why is stratification used here?

Which of the following statements about sampling error is incorrect?

A cybersecurity analyst wishes to survey her client base of 63 companies as to their vulnerability to a new computer virus. She has 63 business cards, all of the identical size, from her contacts in the companies. The analyst decides to drop all of the business cards into a small box, shake them up, and reach in to pick 5 cards for her sample. This procedure is an example of which type of sampling?

The Environmental Protection Agency (EPA) is concerned about a region near an old industrial waste dump and plans to take soil samples to test for toxic chemicals. The EPA is considering using either vertical or horizontal strips with regard to sampling, as shown in the figures below. What are the two most appropriate sampling techniques?

A study is made on whether a particular review book helps students achieve higher scores on the AP Statistics Exam. In comparing the records of 200 students, half of whom purchased the review book, it is noted that the average AP Statistics score is higher for those 100 students who purchased the book. Which of the following are true statements? I. Although this study indicates a relation, it does not prove causation. II. There could well be a confounding variable responsible for the seeming relationship. III. Self-selection here makes drawing a conclusion difficult.

Which of the following would best help avoid response bias?

A buffet restaurant features a salad bar, a chicken and beef entree station, a seafood station, a pizza station, a vegetable station, and a dessert bar, with a total of 235 items. What kind of sampling procedure would be recommended for use by a visiting restaurant evaluator?

A dietary supplement manufacturer wants to test consistency of the krill oil content of omega-3 supplements produced in one factory. The company decides to select one bottle of capsules randomly from each day's production run at the factory and analyze every capsule in this bottle as to krill oil content. What type of sampling is this?

A study is made to determine whether taking multiple AP classes in high school eventually leads to a higher 4-year graduation rate from college. In comparing the college records of 250 students, half of whom took multiple AP courses in high school, it is determined that a higher proportion of the students who took the AP courses graduated from college in four years than did students who had not taken these courses. Based on this study, students are encouraged to take multiple AP courses. Which of the following is an incorrect statement?

A survey with regard to using park funds for building a new skateboard facility resulted in the following table.

Age	21-30	31-40	41-50	51-60	61-70	71-80	Total
For	35	22	18	15	5	1	96
Against	20	33	37	40	50	54	234

Which of the following sampling strategies was most likely used?

To survey the opinions of people attending a Lincoln Center ballet, a surveyor plans to select every 30th theatergoer as he or she exits at the conclusion. Will this method result in a simple random sample?

To conduct a survey on television viewing preferences, a researcher opens a telephone book to a random page, closes his eyes, puts his finger down on the page, and then reads off the next 80 names. Which of the following is not a true statement?

The annual AP national conference is attended by a large number of AP teachers from all AP subject areas. At one of these conferences, a random sample of AP Statistics teachers at the conference was selected and surveyed as to the proportion of their students who go on to do well in college. To what population can the result be generalized?

Sampling error is