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It is difficult to conduct sample surveys on sensitive issues because many people will not answer questions if the answers might embarrass them. Randomized response is an effective way to guarantee anonymity while collecting information on topics such as student cheating or sexual behavior. Here is the idea. To ask a sample of students whether they have plagiarized a term paper while in college, have each student toss a coin in private. If the coin lands heads and they have not plagiarized, they are to answer "No." Otherwise they are to give "Yes" as their answer. Only the student knows whether the answer reflects the truth or just the coin toss, but the researchers can use a proper random sample with follow-up for nonresponse and other good sampling practices. Suppose that in fact the
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- Suppose you are the president of the student government. You wish to conduct a survey to determine the student body's opinion regarding student services. The administration provides you with a list of the names and phone numbers of the 707 registered students. (a) Discuss a procedure you could follow to obtain a simple random sample of 5 students.arrow_forwardSuppose you are the president of the student government. You wish to conduct a survey to determine the student body's opinion regarding student services. The administration provides you with a list of the names and phone numbers of 5,412 registered student. Discuss the procedure you would follow to obtain a systematic random sample of 100 students.arrow_forward1. You are going to ask people if they like ice cream, recording the answer Yes or No. You are going to ask until someone says Yes or you have asked four people. Write out the sample space for this random phenomenon.arrow_forward
- A coach is interested in how many slam dunks the average college freshman at his university can do. Ten volunteers from the senior class step forward. After observing their performance, the coach concluded that college seniors can do an average of 10 slam dunks in a row without missing. what is the sample? what is the population?arrow_forwardThis is part of a practice test, want to see if I am doing it rightarrow_forwardWhich of the following are sources of sampling error and which are sources of nonsampling error? The subject cannot be contacted in five calls. The telephone directory is used as a sampling frame. Data are gathered by asking people to go to a website and answer questions online. A typing error is made in recording the data. The subject lies about past illegal drug use. Interviewers choose people on the street to interview.arrow_forward
- Describe a method for getting a fair and unbiased simple random sample of 12 people if you have a group of 200 people to choose from.arrow_forwardA Statistics Canada researcher selects (at random) 10 apartments in one apartment building. The researcher then interviews all the residents in each of the 10 apartments selected. Which type of sampling did this researcher use?arrow_forwardWhen the Bureau of Labor Statistics conducts a survey, it begins by partitioning the United States adult population into 2,0072,007 groups called primary sampling units. Assume that these primary sampling units all contain the same number of adults. If you randomly select one adult from each primary sampling unit, is the result a simple random sample. Why or why not?arrow_forward
- One cable company advertises that it has excellent customer service. In fact, the company advertises that a technician will be there within 30 minutes of when a service call is placed. One frustrated customer believes this is not the truth, claiming that it takes over 30 minutes for the cable repairman to arrive. The customer asks 15 of his neighbors how long it has taken for the cable repairman to arrive when they have called for him. The sample mean for this group is 32.2 minutes with a sample standard deviation of 3.6 minutes. Test the customer’s claim at the 0.02 level of significance. (a) State the null and alternative hypotheses (b) Find the value of your test statistic. Draw a picture and label its location on the normal curve. Also shade the area where you will find the p-value. (c) Calculate the p-value from the sample data. Compare it to the significance level. Label it’s value and location on your bell curve (d) Write a full…arrow_forwardExplain in detail RANDOM ASSIGNMENT OF SUBJECTS.arrow_forwardAdvertisers contract with Internet service providers and search engines to place ads on websites. They pay a fee based on the number of potential customers who click on their ad. Unfortunately, click fraud—the practice of someone clicking on an ad solely for the purpose of driving up advertising revenue—has become a problem. According to BusinessWeek, 42% of advertisers claim they have been a victim of click fraud. Suppose a simple random sample of 220 advertisers will be taken to learn more about how they are affected by this practice. Use z-table. a. What is the probability that the sample proportion will be within +/- 0.05 of the population proportion experiencing click fraud? (to 4 decimals) b. What is the probability that the sample proportion will be greater than 0.45 ?(to 4 decimals)arrow_forward
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