1. Data gathered from a sample of hospital patients includes information about each patient's age, current residence, primary doctor, and medical diagnosis. The individuals in the data set are the _______

choose the correct answer

A. doctors. B. patients. C. ages. D. current residences. E. medical diagnoses.

2. Which one of the following statements is true?

choose the correct answer

A. Voluntary response samples are never biased. B. A sample should always be exactly 50% as big as a population. C. For a sample to be a simple random sample of size n, n must be a large number. D. A characteristic of an individual is known as a variable. E. A population is a part of a sample.

3. Administrators at Milpitas High School want to know how students feel about recent renovations to the high school library. To learn about the attitudes and opinions of all of its students, the administrators at Milpitas High School obtain an alphabetized list of all students, and they send a survey to every 10th student on the list. In this example, the population is ________

Choose the correct answer

A. all high school students in the United States. B. all of the students who completed a survey. C. all Milpitas High School students. D. all students who regularly use the high school library. E. all residents of the town of Milpitas.

4. Return to Question 3. What type of sampling method did the administrators use? Choose the correct answer

A. A variable sampling method B. A simple random sampling method C. A voluntary response sampling method D. A systematic sampling method E. A stratified random sampling method

5. When a census is taken, the goal is to collect data from_______ Choose the correct answer

A. a simple random sample. B. a very large population. C. exactly 100 individuals. D. all individuals in the entire United States. E. every individual in a population.

6. A data base is maintained with information about every person who has ever attempted to climb Mt. Everest. The data base includes the following variables: whether or not the climber reached the summit of Mt. Everest, the climber's age in years, the climber's height in inches, the country in which the climber currently resides, and the climber's weight in pounds. How many of these variables are categorical? choose the correct answer

A. one B. two C. three D. four E. five

7. We consider the design of a statistical study to be biased if it Choose the correct answer

A. systematically favors certain outcomes. B. always results in a negative outcome. C. always results in a positive outcome. D. has an unpredictable outcome. E. involves less than 100 individuals.

8. Consider all of the students enrolled in an anatomy and physiology class to be a population. Dr. Grey teaches this class in a large lecture hall, and she wants to select a sample of 12 students to help her with a particular class demonstration. Which of the following sampling techniques will result in a simple random sample? Choose the correct answer

A. Breaking the class up into groups by class level (i.e., first-year students, sophomores, juniors, and seniors) and then selecting a sample of three students from each of these four groups.

B. Putting the name of each student onto a slip of paper, mixing all slips of paper in a large box, and drawing 12 slips of paper from the box.

C. Approaching 12 students who arrive early to lecture and telling them they will receive extra credit for participating in a demonstration.

D. Asking for volunteers and choosing the 12 students who raise their hands first to volunteer.

E. All of the above techniques would result in a simple random sample.

9. A sociologist surveys a random sample of 1,000 teenagers. The teenagers are asked the following question: "Have you ever earned extra money by babysitting?" When the results of the survey are published, it is reported that 27% of the surveyed teenagers answered "yes" to the survey question. Based on this information, which one of the following statements is correct?

A. The population is the 1,000 teenagers who were surveyed.

B. The sample is the 27% of the teenagers who said they had earned extra money by babysitting.

C. If 100% of the teenagers had answered "yes" to the survey question, the sociologist would have what is considered to be a census.

D. The individuals in this study are the sociologist and his assistants.

E. None of the above statements are correct.

10. Data is gathered from a sample of OSU students, and each student indicates the total hours of sleep they get during a typical week night. What type of variable is "total hours of sleep"? Choose the correct answer

A. a numerical variable B. a categorical variable C. an independent variable D. a dependent variable E. It's impossible to answer this question without knowing the type of sampling method that was used.