1. Identify the type of sampling method used in each situation:
a. At a large university, all instructors in 3 office buildings are interviewed to determine their level of research interest.
b. A manufacturer checks every 20th product on its assembly line for quality assurance.
c. 6 lottery balls are drawn from a hopper of 269 equal size balls.
d. Everyone who walks into the grocery store between 3:00 pm and 5:00 is asked their opinion about a new traffic light being installed next door.
2. An article cited that someone is murdered every 20 minutes on average in the United States. Based on this statement alone, should you conclude crime is out of control? What questions might you have for the author of this article?
3. Identify the potential source of bias in each situation:
a. Facebook users are asked to click on a survey about their favorite brand of coffee.
b. A group of 100 married men is asked if they have ever cheated on their spouse.
c. Potential voters are asked, “Do you plan to vote for Candidate A, even though all recent polls show he will lose the election?”
4. Decide which type of graph would most appropriately depict the given data:
a. The number of wrestlers in each weight class.
b. The market share of US car manufacturers.
c. The budget for a university’s athletic department.
5. Assume you are the owner of a highly respected law firm. The data below shows the number of cases won each month by two lawyers who work for you.
On average, would you say that these lawyers are performing equally? Why or why not? If you were looking for a lawyer with a reliable number of wins, which lawyer would you choose?
What statistic did you use to come to that conclusion? Back up your decision with statistical evidence. Do NOT just use the mean or median to explain your answer.
a. At a large university, all instructors in 3 office buildings are interviewed to determine their level of research interest.
b. A manufacturer checks every 20th product on its assembly line for quality assurance.
c. 6 lottery balls are drawn from a hopper of 269 equal size balls.
d. Everyone who walks into the grocery store between 3:00 pm and 5:00 is asked their opinion about a new traffic light being installed next door.
2. An article cited that someone is murdered every 20 minutes on average in the United States. Based on this statement alone, should you conclude crime is out of control? What questions might you have for the author of this article?
3. Identify the potential source of bias in each situation:
a. Facebook users are asked to click on a survey about their favorite brand of coffee.
b. A group of 100 married men is asked if they have ever cheated on their spouse.
c. Potential voters are asked, “Do you plan to vote for Candidate A, even though all recent polls show he will lose the election?”
4. Decide which type of graph would most appropriately depict the given data:
a. The number of wrestlers in each weight class.
b. The market share of US car manufacturers.
c. The budget for a university’s athletic department.
5. Assume you are the owner of a highly respected law firm. The data below shows the number of cases won each month by two lawyers who work for you.
| Lawyer A | 42 | 61 | 48 | 54 | 50 | 49 |
| Lawyer B | 51 | 23 | 82 | 44 | 79 | 25 |
On average, would you say that these lawyers are performing equally? Why or why not? If you were looking for a lawyer with a reliable number of wins, which lawyer would you choose?
What statistic did you use to come to that conclusion? Back up your decision with statistical evidence. Do NOT just use the mean or median to explain your answer.
