WGU D582 INTRO TO STATS FOR
RESEARCH UPDATED EXAM QUESTIONS
AND CORRECT ANSWERS
●● Which category of variable describes a color preference in a study
about geographic influences?
Answer: nominal
●● Which category of variable describes a political affiliation in a study
about shared cultural values?
Answer: nominal
●● Which type of variable is a level of education in a study about social
media habits?
Answer: ordinal
●● Which variable is discrete?
Answer: the number of students in a study about classroom size and
learning
●● What is an example of a discrete variable?
Answer: the number of social media accounts in a study about
advertising
,●● Research on student health and wellness at a college is being
conducted. Which variable in the study is continuous?
Answer: body weight
●● Research is being conducted about early childhood development.
Which variable of the study is continuous?
Answer: birth weight in kilograms
●● For a research project, a student surveyed 100 other students, asking
them to identify their favorite musical instrument. The student wants to
create a bar chart to display the data. Which general guideline should be
followed to avoid creating a chart that is misleading?
Answer: use plain bars rather than images
●● A researcher collected data on standardized test scores of 10,000
participants. The researcher wants to be able to see the quartile of the
data and to be able to identify outliers. Which type of graphical display
should be used?
Answer: box plot
●● A researcher wants to display the results of a marathon in a visual
format. There were 10,204 finishers, and the researcher would like to
show the relative frequencies of finishing times based on 10-minute
intervals. Who h type of graphical display should be used?
,Answer: histogram
●● A researcher collected data on the type of vehicles (car, truck, SUV,
minivan, other) people drive. The data includes 500 responses among
the five categories. The researcher wants to create a visual display of the
data. What is the appropriate graphical display?
Answer: bar chart
●● A student surveyed 100 fellow students about their favorite sport to
watch on television. The student wants to visually compare the data
categories. What is the appropriate graphical display?
Answer: bar chart
●● A college professor gave a final exam to all their students. Each
score is out of 100 possible points. The professor wants to compare the
relative frequencies of test scores for the various grade levels (freshmen,
sophomores, etc.) in a visual way so that the data for each grade level is
included. What is the appropriate graphical display?
Answer: frequency polygon
●● Which term describes the shape of the distribution of a histogram
that has a tail to the left side?
Answer: negatively skewed
, ●● A researcher collected data on the heights of a large sample of third-
grade students. The distribution is normal. Which percent describes the
portion of data within one standard deviation of the mean?
Answer: 68%
●● A researcher wants to get feedback from a sample of customers of an
online retailer. The researcher selects every 200th customer from the list
of customers. Which type of sampling is implemented in the scenario?
Answer: systematic
●● What shape describes a distribution that is approximately normal?
Answer: bell shape
●● A researcher created a confidence interval but wants to repeat the
process with changes that will decrease the width of the interval. Which
change results in a narrower interval?
Answer: increase the sample size
●● Which quantity is needed when calculating the endpoints for a
confidence interval?
Answer: sample standard deviation
●● Which quantity is used in the calculations to create a 98% confidence
interval?
RESEARCH UPDATED EXAM QUESTIONS
AND CORRECT ANSWERS
●● Which category of variable describes a color preference in a study
about geographic influences?
Answer: nominal
●● Which category of variable describes a political affiliation in a study
about shared cultural values?
Answer: nominal
●● Which type of variable is a level of education in a study about social
media habits?
Answer: ordinal
●● Which variable is discrete?
Answer: the number of students in a study about classroom size and
learning
●● What is an example of a discrete variable?
Answer: the number of social media accounts in a study about
advertising
,●● Research on student health and wellness at a college is being
conducted. Which variable in the study is continuous?
Answer: body weight
●● Research is being conducted about early childhood development.
Which variable of the study is continuous?
Answer: birth weight in kilograms
●● For a research project, a student surveyed 100 other students, asking
them to identify their favorite musical instrument. The student wants to
create a bar chart to display the data. Which general guideline should be
followed to avoid creating a chart that is misleading?
Answer: use plain bars rather than images
●● A researcher collected data on standardized test scores of 10,000
participants. The researcher wants to be able to see the quartile of the
data and to be able to identify outliers. Which type of graphical display
should be used?
Answer: box plot
●● A researcher wants to display the results of a marathon in a visual
format. There were 10,204 finishers, and the researcher would like to
show the relative frequencies of finishing times based on 10-minute
intervals. Who h type of graphical display should be used?
,Answer: histogram
●● A researcher collected data on the type of vehicles (car, truck, SUV,
minivan, other) people drive. The data includes 500 responses among
the five categories. The researcher wants to create a visual display of the
data. What is the appropriate graphical display?
Answer: bar chart
●● A student surveyed 100 fellow students about their favorite sport to
watch on television. The student wants to visually compare the data
categories. What is the appropriate graphical display?
Answer: bar chart
●● A college professor gave a final exam to all their students. Each
score is out of 100 possible points. The professor wants to compare the
relative frequencies of test scores for the various grade levels (freshmen,
sophomores, etc.) in a visual way so that the data for each grade level is
included. What is the appropriate graphical display?
Answer: frequency polygon
●● Which term describes the shape of the distribution of a histogram
that has a tail to the left side?
Answer: negatively skewed
, ●● A researcher collected data on the heights of a large sample of third-
grade students. The distribution is normal. Which percent describes the
portion of data within one standard deviation of the mean?
Answer: 68%
●● A researcher wants to get feedback from a sample of customers of an
online retailer. The researcher selects every 200th customer from the list
of customers. Which type of sampling is implemented in the scenario?
Answer: systematic
●● What shape describes a distribution that is approximately normal?
Answer: bell shape
●● A researcher created a confidence interval but wants to repeat the
process with changes that will decrease the width of the interval. Which
change results in a narrower interval?
Answer: increase the sample size
●● Which quantity is needed when calculating the endpoints for a
confidence interval?
Answer: sample standard deviation
●● Which quantity is used in the calculations to create a 98% confidence
interval?
