Description
Use statistical software to create, interpret, and analyze two histograms in a Word document.
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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.
Insructions
Your first statistical software assessment includes two sections in which you will do the following:
Create two histograms.
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] Download JASP Step-by-Step: Histograms and Descriptive Statistics [PDF]document for additional help in completing this assessment.
View JASP Speedrun: Descriptive Statistics [Video] for a brief tutorial on this assessment.
As you work on this assessment, refer to the 7864 Data Set Instructions [PDF] Download 7864 Data Set Instructions [PDF]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 Download 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:
Variables and Definitions
Variable Definition
Lowup lower division =1; Upper division =2
Final Final exam: number of correct answers
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 Download grades.jaspfile, compute descriptive statistics, including mean, standard deviation, skewness, and kurtosis for gpa and quiz3.
Variables and Definitions
Variable Definition
GPA Previous grade point average
Quiz3 Quiz 3: number of correct answers
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).
Refer to the Tools and Software: JASP page on Campus for general information. Make sure that your statistical software is downloaded, installed, and running properly on your computer.
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.
Unformatted Attachment Preview
7864 Data Set Instructions
The 7864 data set is fictional data. The data represents a teacher’s recording of student
demographics and academic performance across three sections of their course. Each course
section consists of about 35 students (N = 105).
The data set is located on grades.jasp. You can download grades.jasp from the 7864
assignments instructions area. It will then open in JASP.
There are 21 variables in the course data set. Refer to the table below.
Values
Scale of
measurement
JASP variable
Definition
id
Student identification number
Nominal
lastname
Student last name
Nominal
firstname
Student first name
Nominal
genderidentity
Student gender identity
1 = woman; 2 = man; 3 =
transgender; 4 = nonbinary/non-conforming; 5 =
prefer not to disclose
ethnicity
Student ethnicity
1 = Native American; 2 = Asian;
3 = Black; 4 = White; 5 =
Hispanic
Nominal
year
Class rank
1 = freshman; 2 = sophomore;
3 = junior; 4 = senior
Ordinal
lowup
Lower or upper division
1 = lower; 2 = upper
Nominal
section
Class section
Nominal
gpa
Previous grade point average
Scale
extcr
Did extra credit project?
1 = no; 2 = yes
Nominal
review
Attended review sessions?
1 = no; 2 = yes
Nominal
quiz1
Quiz 1: number of correct answers
Scale
quiz2
Quiz 2: number of correct answers
Scale
quiz3
Quiz 3: number of correct answers
Scale
quiz4
Quiz 4: number of correct answers
Scale
Nominal
1
Values
Scale of
measurement
JASP variable
Definition
quiz5
Quiz 5: number of correct answers
Scale
final
Final exam: number of correct
answers
Scale
total
Total number of points earned
Scale
percent
Final percent
Scale
grade
Final letter grade (A, B, C, D, F)
Nominal
passfail
Passed or failed the course? 1 =
pass; 0 = fail
Nominal
2
J IJASP
BY
BY
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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: [email protected]
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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