WGU D582 INTRO TO STATISTICS FOR RESEARCH | 242
QUESTIONS AND ANSWERS | 2026 UPDATE | WITH
COMPLETE SOLUTION!!
Which variable is quantitative? Answer - skin temperature in a study about
reactions to a new medical treatment
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?
Answer - sample size
What does a researcher need to determine the sample size needed to estimate
a proportion? Answer - approximate value of p
, What is one of the required components of a hypothesis test? Answer -
alternative hypothesis
A researcher is setting up a hypothesis test. Which component is required for
the test? Answer - significance level/p-value
A large-sample hypothesis test for a difference of population proportions was
designed by a researcher. The critical values are -1.282 and 1.282, and the test
statistic is 0.497. Which conclusion should the researcher make? Answer - fail
to reject the null hypothesis
A researcher conducted a large-sample hypothesis test for a difference of
population proportions. The critical values were determined to be -1.645 and
1.645. The test statistic is 1.303. What is the proper conclusion? Answer - fail
to reject the null hypothesis
A researcher conducted a large-sample hypothesis test for a difference of
population proportions. The critical values were determined to bee -2.576 and
2.576. The test statistic is -1.682. Which conclusion is correct? Answer - fail to
reject the null hypothesis
A researcher conducted a large sample hypothesis test for a difference of
population proportions. The critical values were determined to be -2.576 and
2.576. The test statistic is 3.024. What is the proper conclusion? Answer -
reject the null hypothesis
Which factor has an impact on statistical power? Answer - Effect size
Which statement represents one of the underlying assumptions of an
independent t-test? Answer - individuals in the sample were selected
randomly
QUESTIONS AND ANSWERS | 2026 UPDATE | WITH
COMPLETE SOLUTION!!
Which variable is quantitative? Answer - skin temperature in a study about
reactions to a new medical treatment
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?
Answer - sample size
What does a researcher need to determine the sample size needed to estimate
a proportion? Answer - approximate value of p
, What is one of the required components of a hypothesis test? Answer -
alternative hypothesis
A researcher is setting up a hypothesis test. Which component is required for
the test? Answer - significance level/p-value
A large-sample hypothesis test for a difference of population proportions was
designed by a researcher. The critical values are -1.282 and 1.282, and the test
statistic is 0.497. Which conclusion should the researcher make? Answer - fail
to reject the null hypothesis
A researcher conducted a large-sample hypothesis test for a difference of
population proportions. The critical values were determined to be -1.645 and
1.645. The test statistic is 1.303. What is the proper conclusion? Answer - fail
to reject the null hypothesis
A researcher conducted a large-sample hypothesis test for a difference of
population proportions. The critical values were determined to bee -2.576 and
2.576. The test statistic is -1.682. Which conclusion is correct? Answer - fail to
reject the null hypothesis
A researcher conducted a large sample hypothesis test for a difference of
population proportions. The critical values were determined to be -2.576 and
2.576. The test statistic is 3.024. What is the proper conclusion? Answer -
reject the null hypothesis
Which factor has an impact on statistical power? Answer - Effect size
Which statement represents one of the underlying assumptions of an
independent t-test? Answer - individuals in the sample were selected
randomly
