Use statistical software to create, interpret, and analyze two histograms in a Word document.Introduction
Descriptive statistics are just what they sound like, statistics that allow you to describe or summarize the
data with regard to such things as their distribution and their spread. Descriptive statistics provide you
with a picture of your data while inferential statistics (which we will discuss in subsequent assessments)
allow you to draw conclusions about relationships between variables or differences between groups.
A solid understanding of descriptive statistics is foundational to grasping the concepts presented in
inferential statistics. This assessment measures your understanding of key elements of descriptive
statistics.
Your first statistical software assessment includes two sections in which you will do the following:
1. Create two histograms.
2. Calculate measures of central tendency and dispersion.
This will give you some experience with the data set.
Key Details and Instructions
•
Submit your assessment as a Word document.
•
Refer to the JASP Step-by-Step: Histograms and Descriptive Statistics [PDF] document for
additional help in completing this assessment.
•
As you work on this assessment, refer to the data set instructions file for information on
variables used in this course.
•
Provide a title for your document and your name.
Download the 7864 data set, grades.jasp, which is a sample data set, and save it to your computer. The
data represent a teacher’s recording of student demographics and performance on quizzes and a final
exam. For this assessment, you will create and describe two histograms and a descriptives table using
these data.
Section 1: Histograms for Visual Interpretation
Using the final and lowup variables in your grades.jasp data set, create two histograms and paste them
into your Word document:
Variable
Definition
Lowup
lower division =1; Upper division =2
Variable
Definition
Final
Final exam: number of correct answers
Variables and Definitions
Create:
•
A histogram for lower division.
•
A histogram for upper division.
Briefly describe what a visual inspection of this output tells you about the shape of the distributions.
Section 2: Calculate Measures of Central Tendency and Dispersion
Using the grades.jasp file, compute descriptive statistics, including mean, standard deviation, skewness,
and kurtosis for gpa and quiz3.
Variable
Definition
GPA
Previous grade point average
Quiz3
Quiz 3: number of correct answers
Variables and Definitions
Create a descriptives table and paste it into your Word document.
Under the table:
•
Report the mean, standard deviation, skewness, and kurtosis for GPA and quiz3.
•
Briefly describe what skewness and kurtosis tell you about these data with regard to normality.
Submit both sections of your assessment as an attached Word document.
Software
The following statistical analysis software is required to complete your assessments in this course:
•
Jeffreys’s Amazing Statistics Program (JASP).
Competencies Measured
By successfully completing this assessment, you will demonstrate your proficiency in the course
competencies through the following assessment scoring guide criteria:
•
•
•
Competency 4: Interpret the results of statistical analyses.
•
Below the output, provide an accurate interpretation of histograms for lower division
students and upper division students.
•
Below the output, report descriptive statistics and interpret skew and kurtosis values.
Competency 5: Apply a statistical programs procedure to data.
•
Provide histograms for lower division students and upper division students.
•
Provide a descriptive statistics table.
Descriptive Statistics Scoring Guide
CRITERIA
NONPERFORMANCE
BASIC
PROFICIENT
DISTINGUISHED
Provide
histograms for
lower division
students and
upper division
students.
Does not
provide
histograms.
Multiple
errors noted
in the output.
One to two
errors noted
in the output.
Nearly flawless
output.
Below the
output,
provide an
accurate
interpretation
of histograms
for lower
division
students and
upper division
students.
Does not
provide an
interpretation.
Multiple
errors noted
in the
interpretation.
One to two
errors noted
in the
interpretation.
Accurately
interprets the
histograms.
Provide a
descriptive
statistics table.
Does not
provide a
descriptive
statistics table.
Multiple
errors noted
in the output.
One to two
errors noted
in the output.
Nearly flawless
output.
CRITERIA
Below the
output, report
descriptive
statistics and
interpret skew
and kurtosis
values.
NONPERFORMANCE
Does not
provide
descriptive
statistics and/or
interpret skew
and kurtosis
values.
BASIC
PROFICIENT
DISTINGUISHED
Multiple
errors noted
in the
reporting of
descriptive
statistics
and/or
interpretation
of skew and
kurtosis.
One to two
errors noted
in the
reporting of
descriptive
statistics
and/or
interpretation
of skew and
kurtosis.
Accurately
reports
descriptive
statistics and
accurately
interprets skew
and kurtosis.
J IJASP
BY
BY
• ··
______________________________________________________________________________
Histograms and Descriptive Statistics
______________________________________________________________________________
•
•
Part 1: Histograms
Download grades.jasp from Week 2 Assignment Instructions.
Open grades.jasp in JASP. To do this, start JASP. Select the blue
“sandwich” in the top left corner. Select “Open.” Select “Computer.”
Browse to the saved file. Select “Open.”
•
JASP
–
l!!r
Recent Files
Save
X
+
Recent Folders
Computer
X
Save As
OSF
-E-
.,
1′
–
«Desktop > JASP ,
C
p
Export Results
Data Library
Export Data
Organize •
New folder
a
#
oesktop
!_ Download s #
ITJ
Name
I
I• I
grades
Status
0-,temodified
0
Type
AJASPfil~ contai…
8KB
Sync Data
Close
Preferences
A bout
Open
SCREENSHOTS TAKEN FROM JASP version 16.
QUESTIONS? EMAIL: MULTI7864TEAM@CAPELLA.EDU
0
Size
Cancel
•
Part 1 asks for two histograms. Select the Descriptives option from
the menu bar and a new window appears.
—
-1.
lid
Descriptives
T-Tests
ANOVA
Mixed Models
… Descriptive Statistics
‘
id
lastname
&,
&, firstname
••
•
I
gen deride ntity
I
ethnicity
H
Regression
Frequencies
0 0 0 0
Variables
year
low up
I
section
‘
gpa
I
quiz1
I
quiz2
I
quiz3
I
quiz4
A extcr
A review
I
quiz5
,
final
Transpose descriptives table
S1ati stics
Basic plots
Customizable plots
Tables
T
Split
..
–
Select the final variable. Then select the arrow key to move it over
into the Variables box.
-. Descriptive Statistics
‘
–
id
&, lastn ame
&, firstn ame
0 0 0 0
ge nderi dentity
ethni city
Sp lit
e
Select the lowup variable. Select the arrow key to move it over into
the Split box.
0 0 0 0
-. Descriptive Statisti cs
Vari ables
fin al
II
e
Select Basic plots. Select Distribution plots. Your histograms will
appear in a new window.
0 0 0 0
..- Descriptiv,e Statistics
‘
id
lastn ame·
Variables
final
firstrname,
g:ern deride rntity
ethnicity
yea:r
rll section
‘..
gpa
e,xtcr
rn11iew
Q,llll iz.1
1
q,uiiz:2
q,UJ ii23,
Q,llll iz.4
1
I
,
q,uiiZ.5
total
,
pe,rrnrnt
Trans pose descriptives table
•
Basic plots
II Distri bution plots
Sp lit
lowup
Copy and paste the histogram output into a new Word document.
Below the output, briefly describe what a visual inspection of this output
tells you about the shape of the distributions.
Distribution Plots •
fi nal•
lower division
upper division •
(/)
c::,
0
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