Elementary Statistics Exam Questions with
Verified Solutions 2023-2024 Update.
What is an observational study?
A.
An observational study is a list of all individuals in a population along with certain
characteristics of each individual.
B.
An observational study is when a researcher assigns individuals to a certain group,
intentionally changing the value of an explanatory variable, and then recording
the value of the response variable for each group.
C.
An observational study measures the value of the response variable without
attempting to influence the value of either the response or explanatory variables.
- Answer- C
What is a designed experiment?
A.
A designed experiment measures the value of the response variable without
attempting to influence the value of either the response or explanatory variables.
B.
A designed experiment is when a researcher assigns individuals to a certain group,
intentionally changing the value of an explanatory variable, and then recording
the value of the response variable for each group.
C.
A designed experiment is a list of all individuals in a population along with certain
characteristics of each individual. - Answer- B
, Elementary Statistics Exam Questions with
Verified Solutions 2023-2024 Update.
What allows the researcher to claim causation between an explanatory variable
and a response variable? - Answer- A designed experiment
What is meant by confounding? - Answer- It exists in a study when the effects of
two or more explanatory variables are not separated. So any relation that appears
to exist between a certain explanatory variable and the response variable may be
due to some other variable not accounted for in the study
What is a lurking variable? - Answer- Not accounted for in the study but affects
the value of the response variable
What is a confounding variable? - Answer- A confounding variable is an
explanatory variable that was considered in a study whose effect cannot be
distinguished from a second explanatory variable in the study.
Determine whether the study depicts an observational study or an experiment.
A study is conducted to determine if there is a relationship between lung capacity
and proximity to coal mines. A sample of 100 people living within 1 mile of a coal
mine is collected and their lung capacity measured.
Does the description correspond to an observational study or an experiment? -
Answer- The study is an observational study because the study examines
individuals in a sample, but does not try to influence the response variable.
Determine whether the study depicts an observational study or an experiment.
Verified Solutions 2023-2024 Update.
What is an observational study?
A.
An observational study is a list of all individuals in a population along with certain
characteristics of each individual.
B.
An observational study is when a researcher assigns individuals to a certain group,
intentionally changing the value of an explanatory variable, and then recording
the value of the response variable for each group.
C.
An observational study measures the value of the response variable without
attempting to influence the value of either the response or explanatory variables.
- Answer- C
What is a designed experiment?
A.
A designed experiment measures the value of the response variable without
attempting to influence the value of either the response or explanatory variables.
B.
A designed experiment is when a researcher assigns individuals to a certain group,
intentionally changing the value of an explanatory variable, and then recording
the value of the response variable for each group.
C.
A designed experiment is a list of all individuals in a population along with certain
characteristics of each individual. - Answer- B
, Elementary Statistics Exam Questions with
Verified Solutions 2023-2024 Update.
What allows the researcher to claim causation between an explanatory variable
and a response variable? - Answer- A designed experiment
What is meant by confounding? - Answer- It exists in a study when the effects of
two or more explanatory variables are not separated. So any relation that appears
to exist between a certain explanatory variable and the response variable may be
due to some other variable not accounted for in the study
What is a lurking variable? - Answer- Not accounted for in the study but affects
the value of the response variable
What is a confounding variable? - Answer- A confounding variable is an
explanatory variable that was considered in a study whose effect cannot be
distinguished from a second explanatory variable in the study.
Determine whether the study depicts an observational study or an experiment.
A study is conducted to determine if there is a relationship between lung capacity
and proximity to coal mines. A sample of 100 people living within 1 mile of a coal
mine is collected and their lung capacity measured.
Does the description correspond to an observational study or an experiment? -
Answer- The study is an observational study because the study examines
individuals in a sample, but does not try to influence the response variable.
Determine whether the study depicts an observational study or an experiment.
