WGU D772 OBJECTIVE ASSESSMENT | ACTUAL QUESTIONS &
ANSWERS |QS WITH RATIONALES | 100% GUARANTEED PASS
1. What is a sample in statistical research?
A) The entire group of individuals or objects being studied
B) A smaller, more manageable group selected from the population to
represent the larger group
C) A numerical value that describes a population characteristic
D) The actual values of the variables collected
Answer: B) A smaller, more manageable group selected from the
population to represent the larger group
Rationale: A sample is a subset of the population used to make inferences
about the larger group. Researchers use samples because studying an entire
population is often impractical or impossible. The sample should be
representative of the population to allow valid generalizations .
2. What is a population in statistical research?
A) A smaller group selected for study
B) The entire group of individuals or objects that you want to study
C) A numerical value calculated from sample data
D) A characteristic measured on individuals
Answer: B) The entire group of individuals or objects that you want
to study
Rationale: A population is the entire group of individuals or objects that you
want to study. It includes all members that meet the criteria of interest. In
research, the population is the complete set from which a sample may be
drawn .
3. A college student is surveying other students to determine their
preference among three proposed elective courses. The student will
record the major of each survey respondent, and which elective
, they preferred most. Which type of graphical display is appropriate
to show the data?
A) Histogram
B) Pie chart
C) Two-way table
D) Scatterplot
Answer: C) Two-way table
Rationale: A two-way table is appropriate when displaying the relationship
between two categorical variables. In this scenario, both "major" and
"elective preference" are categorical variables. A two-way table allows the
student to see how preferences vary across different majors .
4. What is the difference between a parameter and a statistic?
A) A parameter is fixed and often unknown; a statistic is calculated from
sample data
B) A parameter is calculated from sample data; a statistic describes the
population
C) Both are the same concept
D) A parameter is always known; a statistic is always unknown
Answer: A) A parameter is fixed and often unknown; a statistic is
calculated from sample data
Rationale: A parameter is a fixed numerical value describing a population
characteristic, but it is often unknown because collecting data from every
member of a population is impractical. A statistic is calculated from sample
data and serves as an estimator for the corresponding population
parameter .
5. A study reports that "the average height of 100 adult women
randomly selected from the US is 5'4"." What is the statistic?
A) All adult women in the US
B) The method of random selection
ANSWERS |QS WITH RATIONALES | 100% GUARANTEED PASS
1. What is a sample in statistical research?
A) The entire group of individuals or objects being studied
B) A smaller, more manageable group selected from the population to
represent the larger group
C) A numerical value that describes a population characteristic
D) The actual values of the variables collected
Answer: B) A smaller, more manageable group selected from the
population to represent the larger group
Rationale: A sample is a subset of the population used to make inferences
about the larger group. Researchers use samples because studying an entire
population is often impractical or impossible. The sample should be
representative of the population to allow valid generalizations .
2. What is a population in statistical research?
A) A smaller group selected for study
B) The entire group of individuals or objects that you want to study
C) A numerical value calculated from sample data
D) A characteristic measured on individuals
Answer: B) The entire group of individuals or objects that you want
to study
Rationale: A population is the entire group of individuals or objects that you
want to study. It includes all members that meet the criteria of interest. In
research, the population is the complete set from which a sample may be
drawn .
3. A college student is surveying other students to determine their
preference among three proposed elective courses. The student will
record the major of each survey respondent, and which elective
, they preferred most. Which type of graphical display is appropriate
to show the data?
A) Histogram
B) Pie chart
C) Two-way table
D) Scatterplot
Answer: C) Two-way table
Rationale: A two-way table is appropriate when displaying the relationship
between two categorical variables. In this scenario, both "major" and
"elective preference" are categorical variables. A two-way table allows the
student to see how preferences vary across different majors .
4. What is the difference between a parameter and a statistic?
A) A parameter is fixed and often unknown; a statistic is calculated from
sample data
B) A parameter is calculated from sample data; a statistic describes the
population
C) Both are the same concept
D) A parameter is always known; a statistic is always unknown
Answer: A) A parameter is fixed and often unknown; a statistic is
calculated from sample data
Rationale: A parameter is a fixed numerical value describing a population
characteristic, but it is often unknown because collecting data from every
member of a population is impractical. A statistic is calculated from sample
data and serves as an estimator for the corresponding population
parameter .
5. A study reports that "the average height of 100 adult women
randomly selected from the US is 5'4"." What is the statistic?
A) All adult women in the US
B) The method of random selection
