True or False? In Exercise,

Problem 1E What is the difference between an observational study and an experiment?

Problem 2E What is the difference between a census and a sampling?

Problem 3E What is the difference between a random sample and a simple random sample?

Problem 4E What is replication in an experiment? Why is replication important?

Problem 5E True or False? In Exercise, determine whether the statement is true or false. If it is false, rewrite it as a true statement. A placebo is an actual treatment.

Problem 40EC Who Picked These People? Some polling agencies ask people to call a telephone number and give their response to a question. (a) List an advantage and a disadvantage of a survey conducted in this manner. (b) What sampling technique is used in such a survey?

Problem 7E True or False? In Exercise, determine whether the statement is true or false. If it is false, rewrite it as a true statement. Using a systematic sample guarantees that members of each group within a population will be sampled.

Problem 6E True or False? In Exercise, determine whether the statement is true or false. If it is false, rewrite it as a true statement. A double-blind experiment is used to increase the placebo effect.

Problem 8E True or False? In Exercise, determine whether the statement is true or false. If it is false, rewrite it as a true statement. A census is a count of part of a population.

Problem 9E True or False? In Exercise, determine whether the statement is true or false. If it is false, rewrite it as a true statement. The method for selecting a stratified sample is to order a population in some way and then select members of the population at regular intervals.

Problem 10E True or False? In Exercise, determine whether the statement is true or false. If it is false, rewrite it as a true statement. To select a cluster sample, divide a population into groups and then select all of the members in at least one (but not all) of the groups.

Problem 11E Observational Study or Experiment? In Exercise, determine whether the study is an observational study or an experiment. Explain. In a survey of 177,237 U.S. adults, 65% said they visited a dentist in the last 12 months. (Source: Gallup)

Problem 13E Observational Study or Experiment? In Exercise, determine whether the study is an observational study or an experiment. Explain. To study the effect of music on driving habits, eight drivers (four male and four female) drove 500 miles while listening to different genres of music. (Source: Confused.com)

Problem 14E Observational Study or Experiment? In Exercise, determine whether the study is an observational study or an experiment. Explain. To study predator-prey relationships in the Bering Sea, researchers looked at the feeding behaviors of three species: black-legged kittiwakes, thick-billed murres, and northern fur seals. (Source: PLOS ONE)

Problem 12E Observational Study or Experiment? In Exercise, determine whether the study is an observational study or an experiment. Explain. Researchers demonstrated in people at risk for increased cardiovascular disease that 2000 milligrams per day of acetyl-L-carnitine over a 24-week period lowered blood pressure and improved insulin resistance. (Source: American Heart Association)

Problem 15E Allergy Drug A pharmaceutical company wants to test the effectiveness of a new allergy drug. The company identifies 250 females ages 30 to 35 who suffer from severe allergies. The subjects are randomly assigned into two groups. One group is given the drug and the other is given a placebo that looks exactly like the drug. After six months, the subjects’ symptoms are studied and compared. (a) Identify the experimental units and treatments used in this experiment. (b) Identify a potential problem with the experimental design being used and suggest a way to improve it. (c) How could this experiment be designed to be double-blind?

Random Number Table Use the sixth row of Table 1 in Appendix B to generate 12 random numbers between 1 and 99.

Random Number Table Use the tenth row of Table 1 in Appendix B to generate 10 random numbers between 1 and 920.

Problem 21E Sleep Deprivation A researcher wants to study the effects of sleep deprivation on motor skills. Eighteen people volunteer for the experiment: Jake, Maria, Mike, Lucy, Ron, Adam, Bridget, Carlos, Steve, Susan, Vanessa, Rick, Dan, Kate, Pete, Judy, Mary, and Connie. Use a random number generator to choose nine subjects for the treatment group. The other nine subjects will go into the control group. List the subjects in each group. Tell which method you used to generate the random numbers.

Problem 23E Identifying Sampling Techniques In Exercise, identify the sampling technique used, and discuss potential sources of bias. (if any). Explain.of bias. (if any). Explain. Using random digit dialing, researchers call 1400 people and ask what obstacles (such as childcare) keep them from exercising.

Problem 25E Identifying Sampling Techniques In Exercise, identify the sampling technique used, and discuss potential sources of bias (if any). Explain. Questioning students as they leave a university library, a researcher asks 358 students about their drinking habits.

Problem 24E Identifying Sampling Techniques In Exercise, identify the sampling technique used, and discuss potential sources of bias (if any). Explain. Chosen at random, 500 rural and 500 urban people age 65 or older are asked about their health and their experience with prescription drugs.

Problem 27E Identifying Sampling Techniques In Exercise, identify the sampling technique used, and discuss potential sources of bias (if any). Explain. Chosen at random, 580 customers at a car dealership are contacted and asked their opinions of the service they received.

Problem 26E Identifying Sampling Techniques In Exercise, identify the sampling technique used, and discuss potential sources of bias (if any). Explain. After a hurricane, a disaster area is divided into 200 equal grids. Thirty of the grids are selected, and every occupied household in the grid is interviewed to help focus relief efforts on what residents require the most.

Problem 28E Identifying Sampling Techniques In Exercise, identify the sampling technique used, and discuss potential sources of bias (if any). Explain. Every tenth person entering a mall is asked to name his or her favorite store.

Problem 29E Identifying Sampling Techniques In Exercise, identify the sampling technique used, and discuss potential sources of bias (if any). Explain. Soybeans are planted on a 48-acre field. The field is divided into one-acre subplots. A sample is taken from each subplot to estimate the harvest.

Problem 30E Identifying Sampling Techniques In Exercise, identify the sampling technique used, and discuss potential sources of bias (if any). Explain. From calls made with randomly generated telephone numbers, 1012 respondents are asked if they rent or own their residences.

Problem 31E Choosing Between a Census and a Sampling In Exercise, determine whether you would take a census or use a sampling. If you would use a sampling, decide what sampling technique you would use. Explain. The average age of the 115 residents of a retirement community

Problem 32E Choosing Between a Census and a Sampling In Exercise, determine whether you would take a census or use a sampling. If you would use a sampling, decide what sampling technique you would use. Explain. The most popular type of movie among 100,000 online movie rental subscribers

Problem 34E Recognizing a Biased Question In Exercise, determine whether the survey question is biased. If the question is biased, suggest a better wording. Why does text messaging while driving increase the risk of a crash?

Problem 35E Recognizing a Biased Question In Exercise, determine whether the survey question is biased. If the question is biased, suggest a better wording. How much do you exercise during an average week?

Problem 36E Recognizing a Biased Question In Exercise, determine whether the survey question is biased. If the question is biased, suggest a better wording. Why does the media have a negative effect on teen girls’ dieting habits?

Problem 37E Recognizing a Biased Question In Exercise, determine whether the survey question is biased. If the question is biased, suggest a better wording. Writing A sample of television program ratings by The Nielsen Company is described on page 16. Discuss the strata used in the sample. Why is it important to have a stratified sample for these ratings?

Problem 33E Recognizing a Biased Question In Exercise, determine whether the survey question is biased. If the question is biased, suggest a better wording. Why does eating whole-grain foods improve your health?

Problem 38EC Natural Experiments Observational studies are sometimes referred to as natural experiments. Explain, in your own words, what this means.

What is the difference between an observational study and an experiment?

What is the difference between a census and a sampling?

What is the difference between a random sample and a simple random sample?

What is replication in an experiment? Why is replication important?

True or False? In Exercises 510, determine whether the statement is true or false. If it is false, rewrite it as a true statement A placebo is an actual treatment.

True or False? In Exercises 510, determine whether the statement is true or false. If it is false, rewrite it as a true statement A double-blind experiment is used to increase the placebo effect.

True or False? In Exercises 510, determine whether the statement is true or false. If it is false, rewrite it as a true statement Using a systematic sample guarantees that members of each group within a population will be sampled.

True or False? In Exercises 510, determine whether the statement is true or false. If it is false, rewrite it as a true statement A census is a count of part of a population.

True or False? In Exercises 510, determine whether the statement is true or false. If it is false, rewrite it as a true statement The method for selecting a stratified sample is to order a population in some way and then select members of the population at regular intervals.

True or False? In Exercises 510, determine whether the statement is true or false. If it is false, rewrite it as a true statement To select a cluster sample, divide a population into groups and then select all of the members in at least one (but not all) of the groups.

Observational Study or Experiment? In Exercises 1114, determine whether the study is an observational study or an experiment. Explain In a survey of 177,237 U.S. adults, 65% said they visited a dentist in the last 12 months. (Source: Gallup)

Observational Study or Experiment? In Exercises 1114, determine whether the study is an observational study or an experiment. ExplainResearchers demonstrated in people at risk for increased cardiovascular disease that 2000 milligrams per day of acetyl-L-carnitine over a 24-week period lowered blood pressure and improved insulin resistance. (Source: American Heart Association)

"Observational Study or Experiment? In Exercises 1114, determine whether the study is an observational study or an experiment. Explain" To study the effect of music on driving habits, eight drivers (four male and four female) drove 500 miles while listening to different genres of music. (Source: Confused.com)

"Observational Study or Experiment? In Exercises 1114, determine whether the study is an observational study or an experiment. Explain"To study predator-prey relationships in the Bering Sea, researchers looked at the feeding behaviors of three species: black-legged kittiwakes, thick-billed murres, and northern fur seals. (Source: PLOS ONE)

Allergy Drug A pharmaceutical company wants to test the effectiveness of a new allergy drug. The company identifies 250 females ages 30 to 35 who suffer from severe allergies. The subjects are randomly assigned into two groups. One group is given the drug and the other is given a placebo that looks exactly like the drug. After six months, the subjects symptoms are studied and compared. (a) Identify the experimental units and treatments used in this experiment. (b) Identify a potential problem with the experimental design being used and suggest a way to improve it. (c) How could this experiment be designed to be double-blind?

Shoes A footwear company developed a new type of shoe designed to help delay the onset of arthritis in the knee. Eighty people with early signs of arthritis volunteered for a study. One-half of the volunteers wore the experimental shoes and the other half wore regular shoes that looked exactly like the experimental shoes. The individuals wore the shoes every day. At the conclusion of the study, their symptoms were evaluated and MRI tests were performed on their knees. (Source: Washington Post) (a) Identify the experimental units and treatments used in this experiment. (b) Identify a potential problem with the experimental design being used and suggest a way to improve it. (c) The experiment is described as a placebo-controlled, double-blind study. Explain what this means. (d) Of the 80 volunteers, 40 are men and 40 are women. How could blocking be used in designing this experiment?

Random Number Table Use the sixth row of Table 1 in Appendix B to generate 12 random numbers between 1 and 99.

Random Number Table Use the tenth row of Table 1 in Appendix B to generate 10 random numbers between 1 and 920.

Random Numbers In Exercises 19 and 20, use technology to generate the random numbers. Fifteen numbers between 1 and 150

"Random Numbers In Exercises 19 and 20, use technology to generate the random numbers." Nineteen numbers between 1 and 1000

Sleep Deprivation A researcher wants to study the effects of sleep deprivation on motor skills. Eighteen people volunteer for the experiment: Jake, Maria, Mike, Lucy, Ron, Adam, Bridget, Carlos, Steve, Susan, Vanessa, Rick, Dan, Kate, Pete, Judy, Mary, and Connie. Use a random number generator to choose nine subjects for the treatment group. The other nine subjects will go into the control group. List the subjects in each group. Tell which method you used to generate the random numbers.

Random Number Generation Volunteers for an experiment are numbered from 1 to 90. The volunteers are to be randomly assigned to two different treatment groups. Use a random number generator different from the one you used in Exercise 21 to choose 45 subjects for the treatment group. The other 45 subjects will go into the control group. List the subjects, according to number, in each group. Tell which method you used to generate the random numbers.

Identifying Sampling Techniques In Exercises 2330, identify the sampling technique used, and discuss potential sources of bias (if any). Explain. Using random digit dialing, researchers call 1400 people and ask what obstacles (such as childcare) keep them from exercising.

Identifying Sampling Techniques In Exercises 2330, identify the sampling technique used, and discuss potential sources of bias (if any). Explain.Chosen at random, 500 rural and 500 urban people age 65 or older are asked about their health and their experience with prescription drugs.

Identifying Sampling Techniques In Exercises 2330, identify the sampling technique used, and discuss potential sources of bias (if any). Explain.Questioning students as they leave a university library, a researcher asks 358 students about their drinking habits.

Identifying Sampling Techniques In Exercises 2330, identify the sampling technique used, and discuss potential sources of bias (if any). Explain.After a hurricane, a disaster area is divided into 200 equal grids. Thirty of the grids are selected, and every occupied household in the grid is interviewed to help focus relief efforts on what residents require the most.

Identifying Sampling Techniques In Exercises 2330, identify the sampling technique used, and discuss potential sources of bias (if any). Explain.Chosen at random, 580 customers at a car dealership are contacted and asked their opinions of the service they received.

Identifying Sampling Techniques In Exercises 2330, identify the sampling technique used, and discuss potential sources of bias (if any). Explain.Every tenth person entering a mall is asked to name his or her favorite store.

Identifying Sampling Techniques In Exercises 2330, identify the sampling technique used, and discuss potential sources of bias (if any). Explain.Soybeans are planted on a 48-acre field. The field is divided into one-acre subplots. A sample is taken from each subplot to estimate the harvest.

Identifying Sampling Techniques In Exercises 2330, identify the sampling technique used, and discuss potential sources of bias (if any). Explain.From calls made with randomly generated telephone numbers, 1012 respondents are asked if they rent or own their residences.

Choosing Between a Census and a Sampling In Exercises 31 and 32, determine whether you would take a census or use a sampling. If you would use a sampling, decide what sampling technique you would use. Explain.The average age of the 115 residents of a retirement community

Choosing Between a Census and a Sampling In Exercises 31 and 32, determine whether you would take a census or use a sampling. If you would use a sampling, decide what sampling technique you would use. Explain.The most popular type of movie among 100,000 online movie rental subscribers

Recognizing a Biased Question In Exercises 3336, determine whether the survey question is biased. If the question is biased, suggest a better wording Why does eating whole-grain foods improve your health?

Recognizing a Biased Question In Exercises 3336, determine whether the survey question is biased. If the question is biased, suggest a better wording Why does text messaging while driving increase the risk of a crash?

Recognizing a Biased Question In Exercises 3336, determine whether the survey question is biased. If the question is biased, suggest a better wording How much do you exercise during an average week?

Recognizing a Biased Question In Exercises 3336, determine whether the survey question is biased. If the question is biased, suggest a better wording Why does the media have a negative effect on teen girls dieting habits?

Writing A sample of television program ratings by The Nielsen Company is described on page 16. Discuss the strata used in the sample. Why is it important to have a stratified sample for these ratings?

Natural Experiments Observational studies are sometimes referred to as natural experiments. Explain, in your own words, what this means.

Open and Closed Questions Two types of survey questions are open questions and closed questions. An open question allows for any kind of response; a closed question allows for only a fixed response. An open question and a closed question with its possible choices are given below. List an advantage and a disadvantage of each question. Open Question What can be done to get students to eat healthier foods Closed Question How would you get students to eat healthier foods? 1. Mandatory nutrition course 2. Offer only healthy foods in the cafeteria and remove unhealthy foods 3. Offer more healthy foods in the cafeteria and raise the prices on unhealthy foods

Who Picked These People? Some polling agencies ask people to call a telephone number and give their response to a question. (a) List an advantage and a disadvantage of a survey conducted in this manner. (b) What sampling technique is used in such a survey?

Analyzing a Study Find an article that describes a statistical study. (a) Identify the population and the sample. (b) Classify the data as qualitative or quantitative. Determine the level of measurement. (c) Is the study an observational study or an experiment? If it is an experiment, identify the treatment. (d) Identify the sampling technique used to collect the data