Topic 3 Concept Check

The Bureau of Labor Statistics announces that last month it interviewed all members of the labor force in a sample of 60,000 households; 4.9% of the people interviewed were unemployed. 4.9% in this scenario is a…? a.Population b.Parameter c.Statistic d.Sample Table

A study of voting chose 663 registered voters at random shortly after an election. Of these, 72% said they had voted in the election. Election records show that only 56% of registered voters voted in the election. 56% in this scenario is a … ? a.Population b.Parameter c.Statistic d.Sample Table

You have data for many families on the parents’ income and the years of education their eldest child completes. What is the explanatory variable? a.Parents’ income b.Years of education c.Age of eldest child d.Number of children in family Table

A study of cell phones and the risk of brain cancer looked at a group of 469 people who have brain cancer. The investigators matched each cancer patient with a person of the same sex, age, and race who did not have brain cancer, then asked about use of cell phones. Is this an observational study? a.Yes b.No c.Depends on results Table

A study of cell phones and the risk of brain cancer looked at a group of 469 people who have brain cancer. The investigators matched each cancer patient with a person of the same sex, age, and race who did not have brain cancer, then asked about cell phone use. What is the explanatory variable? a.Brain cancer presence b.Age c.Race d.Gender e.Cell phone usage Table

A study of cell phone usage and the risk of brain cancer looked at a group of 469 people who have brain cancer. The investigators matched each cancer patient with a person of the same sex, age, and race who did not have brain cancer, then asked about use of cell phones. What is the response variable? a.Brain cancer presence b.Age c.Race d.Gender e.Cell phone usage Table