Stat 212 Review Exam Questions with Correct Answers
Question 1.
Which of the following is an underlying assump-tion of the pooled t-test?
Correct Answer: The two population variances are assumed to be equal
Question 2.
When performing a hypothesis test upon two dependent samples, what is the variable of
in-terest?
Correct Answer: the differences that exist between the matched-pair data
Question 3.
True or False: The pooled t-test assumes that the variances of the two pop-ulations are
equal.
Correct Answer: True
Question 4.
Statistics definition
Correct Answer: the science of collecting, organizing, summarizing, and
in-formation to draw conclusions or answer questions. It is also about providing
measure of confidence in any conclusions
Question 5.
What is a population?
Correct Answer: The entire group of individuals to be studied
Question 6.
What is a response vari-able?
Correct Answer: The variable of interest in the outcome of a study
Question 7.
What is a quantitative variable?
Correct Answer: This provides numerical measures of individuals. The values of
can be added or subtracted, and provide meaningful results.
Question 8.
What is a qualitative vari-able?
Correct Answer: Allow classification of individuals based on some attribute or
, Question 9.
What is a variable?
Correct Answer: The characteristics of the individuals within the population
Question 10.
What is a designed exper-iment?
Correct Answer: A researcher randomly assigns the individuals in a study to
intentionally manipulates the value of the explanatory variable and
controls other explanatory variables at fixed values, and then records the value
the response variable for each individual.
Question 11.
What is an observational study?
Correct Answer: A researcher measures the value of the response variable
attempting to influence the value of either the response or explanatory
That is, the researcher observes the behavior of individuals in the study and
the values of the explanatory and response variables.
Question 12.
What is a lurking vari-able?
Correct Answer: This is an explanatory variable that was not considered in a
but that affects the value of the response variable in the study. In addition,
are typically related to explanatory variables considered in the study.
Question 13.
What is a confounding variable?
Correct Answer: This occurs when the effects of two or more explanatory
are not separated. Therefore, any relation that may exist between an
variable and the response variable may be due to some other variable not
for in the study.
Question 14.
What is the process of sta-tistics?
Correct Answer: 1. Identify the Research Objective
2. Collect the Data Needed to Answer the Research Question(s)
3. Describe the Data
4. Perform Inference
Question 15.
What is the first step in the process of statistics?
Correct Answer: Identify the research objective
Question 1.
Which of the following is an underlying assump-tion of the pooled t-test?
Correct Answer: The two population variances are assumed to be equal
Question 2.
When performing a hypothesis test upon two dependent samples, what is the variable of
in-terest?
Correct Answer: the differences that exist between the matched-pair data
Question 3.
True or False: The pooled t-test assumes that the variances of the two pop-ulations are
equal.
Correct Answer: True
Question 4.
Statistics definition
Correct Answer: the science of collecting, organizing, summarizing, and
in-formation to draw conclusions or answer questions. It is also about providing
measure of confidence in any conclusions
Question 5.
What is a population?
Correct Answer: The entire group of individuals to be studied
Question 6.
What is a response vari-able?
Correct Answer: The variable of interest in the outcome of a study
Question 7.
What is a quantitative variable?
Correct Answer: This provides numerical measures of individuals. The values of
can be added or subtracted, and provide meaningful results.
Question 8.
What is a qualitative vari-able?
Correct Answer: Allow classification of individuals based on some attribute or
, Question 9.
What is a variable?
Correct Answer: The characteristics of the individuals within the population
Question 10.
What is a designed exper-iment?
Correct Answer: A researcher randomly assigns the individuals in a study to
intentionally manipulates the value of the explanatory variable and
controls other explanatory variables at fixed values, and then records the value
the response variable for each individual.
Question 11.
What is an observational study?
Correct Answer: A researcher measures the value of the response variable
attempting to influence the value of either the response or explanatory
That is, the researcher observes the behavior of individuals in the study and
the values of the explanatory and response variables.
Question 12.
What is a lurking vari-able?
Correct Answer: This is an explanatory variable that was not considered in a
but that affects the value of the response variable in the study. In addition,
are typically related to explanatory variables considered in the study.
Question 13.
What is a confounding variable?
Correct Answer: This occurs when the effects of two or more explanatory
are not separated. Therefore, any relation that may exist between an
variable and the response variable may be due to some other variable not
for in the study.
Question 14.
What is the process of sta-tistics?
Correct Answer: 1. Identify the Research Objective
2. Collect the Data Needed to Answer the Research Question(s)
3. Describe the Data
4. Perform Inference
Question 15.
What is the first step in the process of statistics?
Correct Answer: Identify the research objective
