Statistical Questions, Observational Study, Experiment, Population

Determining if students using a calculator on a math final exam score better than students who do not use a calculator 

• Cenus

• Sample Survey

• Experiment

• Observational Study

Choosing people at random at the supermarket and asking them to taste two brands of orange juice to determine which brand they prefer.

• Census

• Sample Survey

• Experiment

• Observational Study

Determine if people who take vitamin C every day are less likely to get colds.

• Cencus

• Sample Survey

• Experiment

• Observational Study

Attempts to understand a cause-and-effect relationship with using a control group by assigning treatment activity for one more group and giving as well as giving a treatment to influence the study.

• Observational Study

• Experimental Study

According to a random telephone survey of 200 adults, 75% of all working adults in the U.S. are satisfied with their current job. What is the population in this survey?

• 200 adults

• adults in the U.S.

• 75% of adults

One group of subjects was given an herbal supplement and another group was given a placebo. After one year, the number of illnesses each group had was compared.

• Observational Study

• Experiment

A study where researchers deliberately impose treatment on the individuals.

• Experiment

• Observational Study

• Survey

• Census

A professor finds that people who are obese have higher cholesterol levels than those who are not obese.

• Observational Study

• Experiment

Research in which data is collected, by observation or survey, about some characteristic of the population

• Observational study

• Population

• Control group

• Variable of interest

Which scenario is best described as an observational study?

• For a class project, students in Health class ask every 10^th student entering the school if they eat breakfast in the morning

• A social researcher wants to learn whether or not there is a link between attendance and grades. She gathers data from 15 school districts

• A researcher wants to learn whether or not there is a link between children’s daily amount of physical activity and their overall energy level. During lunch at the local high school, she distributed a short questionnaire to students in the cafeteria

• Sixty seniors taking a course in Advanced Algebra Concepts are randomly divided into two classes. One class uses a graphing calculator all the time, and the other class never uses graphing calculators. A guidance counselor wants to determine whether there is a link between graphing calculator use and students’ final exam grades