WGU C784 Module 5 | Applied
Healthcare Statistics Exam | Rated A+ |
2025 Guide
An exercise physiologist was interested in how age affects reaction time.
He sampled a population ranging in age from 10 years old to 70 years
old. Subjects were asked to complete a simple reaction time test. The
test consisted of subjects sitting in front of a computer, and clicking a
mouse when the image of a circle on a screen changed color from black
to red. Subjects were asked to attempt the task 5 times. The times from
the five trials were averaged to give each subject an overall reaction time
score. Which numerical measure could be used to analyze the strength
of the relationship between age and reaction time?
a. Correlation coefficient
b. Conditional percentages
c. Mean
d. Five-number Summary
- Correct Answer - a. Correlation coefficient
Consider a study on whether a certain medication improves kidney
function in patients with chronic kidney disease. The Glomerular
Filtration Rate (GFR) was collected for two groups: a treatment group
and a placebo group. The researchers want to compare the middle 50%
of the data for both groups. Which numerical measure would identify the
two values that 50% of the data falls between for both groups?
,a. Median
b. Five-number summary
c. Mode
d. Joint Frequencies
There are four examples of scatterplots, representing (Q→Q):
_______________ correlation, ____________ correlation, ________
correlation, _______________ relationship
- Correct Answer - There are four examples of scatterplots, representing
(Q→Q): positive correlation, negative correlation, no correlation, non-
linear relationship
Scatterplot (a) shows a_______________________ correlation between
the variables because as the x -variable increases, the y -variable
increases. - Correct Answer - Scatterplot (a) shows a positive correlation
Scatterplot (b) shows a ____________________________ correlation
because as the x -variable increases, the y -variable decreases.
- Correct Answer - Scatterplot (b) shows a negative correlation because
as the x -variable increases, the y -variable decreases.
Scatterplot (c) shows ________________________ ; there is no
apparent overall trend between the two variables.
, - Correct Answer - Scatterplot (c) shows no correlation*; there is no
apparent overall trend between the two variables.
Scatterplot (d) shows a____________________, or
____________________, relationship.
- Correct Answer - Scatterplot (d) shows a nonlinear*, or curvilinear,
relationship.
The relationship between two quantitative variables ( Q→Q ) can be
described by looking at a scatterplot of the two variables. We use three
characteristics to describe the relationship: _______________ ,
_____________, and _______________.
- Correct Answer - direction, form, and strength
If a scatterplot shows a pattern of points that increase from the lower left
corner of the graph to the upper right corner, we say that there is a
___________________________ correlation between the two variables:
when the x -variable increases, the y -variable increases.
When the pattern goes from the upper left corner of the graph to the
lower right corner, we say that there is a _________________________
correlation between the two variables: when the x -variable increases,
the y -variable decreases. - Correct Answer - If a scatterplot shows a
pattern of points that increase from the lower-left corner of the graph to
the upper right corner, we say that there is a "positive" correlation
Healthcare Statistics Exam | Rated A+ |
2025 Guide
An exercise physiologist was interested in how age affects reaction time.
He sampled a population ranging in age from 10 years old to 70 years
old. Subjects were asked to complete a simple reaction time test. The
test consisted of subjects sitting in front of a computer, and clicking a
mouse when the image of a circle on a screen changed color from black
to red. Subjects were asked to attempt the task 5 times. The times from
the five trials were averaged to give each subject an overall reaction time
score. Which numerical measure could be used to analyze the strength
of the relationship between age and reaction time?
a. Correlation coefficient
b. Conditional percentages
c. Mean
d. Five-number Summary
- Correct Answer - a. Correlation coefficient
Consider a study on whether a certain medication improves kidney
function in patients with chronic kidney disease. The Glomerular
Filtration Rate (GFR) was collected for two groups: a treatment group
and a placebo group. The researchers want to compare the middle 50%
of the data for both groups. Which numerical measure would identify the
two values that 50% of the data falls between for both groups?
,a. Median
b. Five-number summary
c. Mode
d. Joint Frequencies
There are four examples of scatterplots, representing (Q→Q):
_______________ correlation, ____________ correlation, ________
correlation, _______________ relationship
- Correct Answer - There are four examples of scatterplots, representing
(Q→Q): positive correlation, negative correlation, no correlation, non-
linear relationship
Scatterplot (a) shows a_______________________ correlation between
the variables because as the x -variable increases, the y -variable
increases. - Correct Answer - Scatterplot (a) shows a positive correlation
Scatterplot (b) shows a ____________________________ correlation
because as the x -variable increases, the y -variable decreases.
- Correct Answer - Scatterplot (b) shows a negative correlation because
as the x -variable increases, the y -variable decreases.
Scatterplot (c) shows ________________________ ; there is no
apparent overall trend between the two variables.
, - Correct Answer - Scatterplot (c) shows no correlation*; there is no
apparent overall trend between the two variables.
Scatterplot (d) shows a____________________, or
____________________, relationship.
- Correct Answer - Scatterplot (d) shows a nonlinear*, or curvilinear,
relationship.
The relationship between two quantitative variables ( Q→Q ) can be
described by looking at a scatterplot of the two variables. We use three
characteristics to describe the relationship: _______________ ,
_____________, and _______________.
- Correct Answer - direction, form, and strength
If a scatterplot shows a pattern of points that increase from the lower left
corner of the graph to the upper right corner, we say that there is a
___________________________ correlation between the two variables:
when the x -variable increases, the y -variable increases.
When the pattern goes from the upper left corner of the graph to the
lower right corner, we say that there is a _________________________
correlation between the two variables: when the x -variable increases,
the y -variable decreases. - Correct Answer - If a scatterplot shows a
pattern of points that increase from the lower-left corner of the graph to
the upper right corner, we say that there is a "positive" correlation
