Hard - Quiz 1

Can you evaluate competing poll results, distinguish experiments from observational studies, and reason precisely about what confidence levels actually mean?

Question 1 of 5

0 of 5 answered Score: 0%

Question 1

In a poll of registered voters, Candidate A has 48% support with a margin of error of 3 percentage points, and Candidate B has 45% support with a margin of error of 3 percentage points. Can we conclude that Candidate A is in the lead?

🔒 Answer question 1 to unlock

A health study tracks 5,000 adults over 10 years and finds that those who eat breakfast daily have lower rates of heart disease than those who skip breakfast. A news headline states: "Eating breakfast prevents heart disease." What is the main flaw in this claim?

🔒 Answer question 2 to unlock

A survey of 100 randomly selected adults has a margin of error of 6 percentage points. If the researchers increase the sample to 400 randomly selected adults, what would the approximate new margin of error be?

🔒 Answer question 3 to unlock

A university study finds that students who use a tutoring center earn higher GPAs than those who do not. The researchers note that all participants volunteered for the study. To which group can the results most appropriately be generalized?

🔒 Answer question 4 to unlock

A researcher states: "We are 95% confident that the true proportion of city residents who support the new transit plan is between 0.58 and 0.66." Which of the following correctly describes what "95% confident" means?

correct answers

Did you find this quiz useful?