Designing Effective Statistical Studies

What is the primary purpose of random assignment in an experimental study?

• To ensure that the sample is representative of the population

• To eliminate bias in the selection of treatment groups

• To increase the sample size

• To ensure that the study is ethical

Tags

CCSS.HSS.IC.B.3

Which of the following is a key characteristic of a well-designed observational study?

• Random assignment of subjects to treatment groups

• Manipulation of the independent variable

• Control of confounding variables

• Random selection of subjects from the population

In a study, what is the term for a variable that is not of interest but may affect the outcome of the experiment?

• Independent variable

• Dependent variable

• Confounding variable

• Control variable

Which of the following best describes a double-blind experiment?

• Only the subjects do not know which treatment they are receiving

• Only the researchers do not know which treatment the subjects are receiving

• Both the subjects and the researchers do not know which treatment the subjects are receiving

• Neither the subjects nor the researchers are involved in the study

What is the main advantage of using a matched pairs design in an experiment?

• It allows for a larger sample size

• It controls for variables that could affect the outcome

• It simplifies the data analysis process

• It ensures that the sample is representative of the population

Which of the following is an example of a categorical variable?

• Height in centimeters

• Weight in kilograms

• Type of car (sedan, SUV, truck)

• Temperature in degrees Celsius

Tags

CCSS.HSS.ID.B.5

In a study, what is the term for the group that does not receive the experimental treatment?

• Experimental group

• Control group

• Treatment group

• Placebo group

Tags

CCSS.HSS.IC.B.5

Which of the following is a potential source of bias in a survey study?

• Random sampling

• Large sample size

• Leading questions

• Use of control groups

What is the purpose of using a placebo in an experiment?

• To ensure that the sample is representative

• To control for the placebo effect

• To increase the sample size

• To manipulate the independent variable

Tags

CCSS.HSS.IC.B.5

Which of the following is a method to reduce variability in experimental results?

• Increasing the number of treatments

• Random assignment of subjects

• Increasing the number of confounding variables

• Decreasing the sample size

Tags

CCSS.HSS.IC.B.5

CCSS.HSS.IC.B.3