Informed consent can be tricky to obtain when the subjects are
(A) agricultural plots
(B) industrial parts
(C) volunteers
(D) children
Answer: (D) children
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Stats 110
- The presidential election campaign is in full swing, and the candidates have hired polling organizations to take regular polls to find out what the voters think about the issues. What does the standard of informed consent require the polling organizations to tell potential respondents?
- A local newspaper in the State of Connecticut conducts a poll on whether the people of the state believe the "No Child Left Behind" law is effective. The newspaper contacts 1000 subscribers. The population of this poll is:
- The sampling variability of a statistic reflects
- A manufacturer of chisels is interested in determining how the angle at which the cutting edge is sharpened affects tool abrasion. To answer this question, engineers obtain 20 similar chisels. They sharpen five chisels at each of 22.5, 25, 27.5, and 30 degrees. Then, they measure the amount of abrasion (rated on a scale of 1 to 10, with 10 being the worst) after cutting several mortises (square holes) in 3/4-inch hard maple boards. Which of the following is the explanatory variable in the given study?
- In a sample survey, the following question was asked: "Which of the following best represents your opinion on gun control?
- A New York Times Poll on women's issues interviewed 1025 women randomly selected from the United States, excluding Alaska and Hawaii. The poll found that 47% of the women said they do not get enough time for themselves. The poll announced a margin of error of ±3 percentage points for 95% confidence in its conclusions. The confidence statement, in relation to the given scenario, is: "We are 95% confident that between 44% and 50% of all women would say that they do not get enough time for themselves." Which of the following statements correctly explains the meaning of the term '95% confidence', in the confidence statement?
- A national survey of TV network news viewers found that 48% said they would believe a phone-in poll of 300,000 persons rather than a random sample of 1000 persons. Of the viewers, 42% said they would believe the random sample poll. Which of the following statements correctly explains why the opinions of only 1000 randomly chosen respondents are a better guide to what all people think than the opinions of 300,000 callers?
- Studies have suggested that compounds in broccoli might combat the effects of overexposure to ultraviolet radiation. We conduct an experiment to determine whether a cream consisting of a broccoli extract reduces sunburn pain. Sixty patients suffering from pain from severe sunburn are available. What is a good way to conduct the experiment?
- Taking a larger sample size will reduce what about a resulting statistic?
- For which type of sample can a reliable margin of error be derived?
- A researcher observes the body-mass index (BMI), the number of school meals eaten, and the sex for a sample of schoolchildren. The goal of the study is to determine the relationship between BMI and number of school meals, and whether this relationship depends on the child's sex. What type of study is this?
- A researcher observes the body-mass index (BMI), the number of school meals eaten, and the sex for a sample of schoolchildren. What are the individuals in the data set?
- A researcher observes the body-mass index (BMI), the number of school meals eaten, and the sex for a sample of schoolchildren. What are the variables in the data set?
- If a survey suffers from a high nonresponse rate, what is a possible remedy?
- An example of a response error is a sample survey is when
- What is an ethical problem with placebo-controlled studies?
- In the Tuskegee Syphilis Study, the researchers
- What is the purpose of an institutional review board?
- Suppose in a study of federal tax revenues, a sample of citizens' taxable incomes for 2014 is collected. The researchers intend to summarize the data for each state, but keep individuals' data private. This study is
- Suppose an experiment has two explanatory variables. The first explanatory variable has 2 possible values and the second explanatory variable has 4 possible values. How many treatments are there in the experiment?
- In a weight-loss study, 10% of the subjects getting the experimental drug dropped out before the finish and 58% of the subjects getting the placebo dropped out. It is speculated that subjects in a weight-loss experiment may prematurely drop out when they find themselves not losing weight. This is an example of:
- Suppose subjects in an experiment are initially separated into age groups. Then, within each age group, subjects are randomly assigned to one of 4 different treatments. This is a:
- Which is NOT one of the three major principles of experimental design?
- In a sample of professors on a university campus, the researcher randomly selects 5 academic departments, and then interviews each professor in those selected departments. What type of sampling scheme is this?
If the answers is incorrect or not given, you can answer the above question in the comment box. If the answers is incorrect or not given, you can answer the above question in the comment box.