EVEN NUMBERS
1. Hospitals Currently, there are 5723 registered hospitals in the United States. a. Are the numbers of hospitals in different states discrete or continuous? b. What is the level of measurement for the numbers of hospitals in different years? (nominal, ordinal, interval, ratio) c. If a survey is conducted by randomly selecting 10 patients in every hospital, what type of sampling is used? (random, systematic, convenience, stratified, cluster) d. If a survey is conducted by randomly selecting 20 hospitals and interviewing all of the mem- bers of each board of directors, what type of sampling is used? (random, systematic, conve nience, stratified, cluster) e. What is wrong with surveying patient satisfaction by mailing questionnaires to 10,000 ran- domly selected patients? 2. What's Wrong? A survey sponsored by the American Laser Centers included responses from 575 adults, and 24% of the respondents said that the face is their favorite body part (based on data from USA Today). What is wrong with this survey? 3. What's Wrong? A survey included 2028 responses from Internet users who decided to respond to a question posted by AOL. Here is the question: "How often do you drink soda?" Among the respondents, 33% said that they drink soda almost every day. What is wrong with this survey? 4. Sampling Seventy-two percent of Americans squeeze their toothpaste tube from the top, This and other not-so-serious findings are included in The First Really Important Survey of American Habits. Those results are based on 7000 responses from the 25,000 questionnaires that were mailed. a. What is wrong with this survey? b. As stated, the value of 72% refers to all Americans, so is that 72% a statistic or a parameter? Explain. c. Does the survey constitute an observational study or an experiment? 5. Percentages Vaist a. The labels on U-Turn protein energy bars include the statement that these bars contain "125% less fat than the leading chocolate candy brands" (based on data from Consumer Reports magazine). What is wrong with that claim? VaIst b. In a Pew Research Center poll on driving, 58% of the 1 182 respondents said that they like to drive. What is the actual number of respondents who said that they like to drive? them C. In a Pew Research Center poll on driving, 331 of the 1182 respondents said that driving is a y re- chore. What percentage of respondents said that driving is a chore? 6. Simple Random Sample Which of the following is / are simple random samples? s and 21% a. As Lipitor pills are being manufactured, a quality control plan is to select every 500th pill and test it to confirm that it contains 80 mg of atorvastatin. b. To test for a gender difference in the way that men and women make online purchases, of an Gallup surveys 500 randomly selected men and 500 randomly selected women. C. A list of all 10,877 adults in Trinity County, California, is obtained; the list is numbered from a con- 1 to 10,877; and then a computer is used to randomly generate 250 different numbers between 1 and 10,877. The sample consists of the adults corresponding to the selected numbers
