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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.

Scale of JASP variable Definition Values measurement

id Student identification number Nominal

lastname Student last name Nominal

firstname Student first name Nominal

1 = woman; 2 = man; 3 = binary/non-conforminggenderidentity Student gender identity Nominal 4 = prefer not to disclose

1 = Native American; 2 = Asian; ethnicity Student ethnicity 3 = Black; 4 = White; 5 = Nominal

Hispanic

1 = freshman; 2 = sophomore; year Class rank Ordinal

3 = junior; 4 = senior

lowup Lower or upper division 1 = lower; 2 = upper Nominal

section Class section

gpa Previous grade point average Scale

extcr Did extra credit project? 1 = no; 2 = yes Nominal

review Attended review sessions?

quiz1 Quiz 1: number of correct answers

quiz2 Quiz 2: number of correct answers Scale

Nominal

1 = no; 2 = yes Nominal

Scale

quiz3 Quiz 3: number of correct answers Scale

quiz4 Quiz 4: number of correct answers Scale

1

Scale of JASP variable Definition Values measurement

quiz5 Quiz 5: number of correct answers Scale

Final exam: number of correct final Scale answers

total Total number of points earned Scale

percent Final percent Scale

grade Final letter grade (A, B, C, D, F) Nominal

Passed or failed the course? 1 = passfail Nominal pass; 0 = fail

2

d1 IJASP -y BY

B - ~

• ··

• •

0 grades* (C:\ Users\swowr\ OneDrive\ Deslctop)

ILi l.!f : U!f T

Descriptives T-Tests ANOVA Mix,

1 l!l Classical ge n,

Independent Samples T-Test

Paired Samples T-Test

One Sample T-Test

l!l Bayesian

Independent Samples T-Test

Paired Samples T-Test

One Sample T-Test

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t-Test DAA Section 2: Testing Assumptions

Open grades.jasp.

Section 2 asks for a homogeneity of variance test. Select T-Tests. Select Classical Independent Samples T-Test. A new window appears.

SCREENSHOTS TAKEN FROM JASP version 16.

QUESTIONS? EMAIL: [email protected]

• ..- Independent Samples T-Test

• ..- Independent Samples T-Test

, quiz1

, quiz2

, quiz3

, quiz4

, quiz5

, total

�

�

�

�

0 0 0 0 !Dependent Variables !

Grouping Variable

Dependent Variables

final

Grouping Variable

0 0 0 0

..

Select final. Select the arrow to move final to the Dependent Variables box.

Select review. Select the arrow to move review to the Grouping Variable box.

•

•

T lnaependent Samples T-Tes,

• · lidS Lrla l l l e

& , firstname

A gen deridentity

A ethnicity

I year ,. lowup ,. section

' gpa ,. extcr

quiz.1

Tests

II Student

Welch

Mann-Whitney

Alt. Hypothesis

0 Group 1 f. Group 2

Group 1 > Group 2

Group 1 < Group 2

! Ass umption Checks !

Normality

Equality of variances

� Dependent Variables

, final

Grouping Variable

� A review

Additional Statistics

Locati on parameter

Confidence inteival 95.0

Effect siz.e

Cohens ct

Glass delta

Hedges' g

Confidence inteival 95 %

Descriptives

Descriptives plots

Confidence mteival 95.0

Raincloud plots

Horiz.ontal displa,

Vovk-Sell ke maximum p-ratio

Missing Values

%

%

O Exclude cases per depe nde nt variable

Exclude cases listwise

Assumption Checks

lies of Equalf:ly o·· Variances (Leve e's)

F df12 p

fi nal � �

Select Equality of variances under Assumption Checks.

Copy and paste the Assumption Checks output in DAA Section 2.

Below the output, interpret the Levene’s Test; determine if the assumption of homogeneity IS violated or IS NOT violated.

• ..- Independent Samples T-Test

•

- lcll:Hlli::Hll t:!:

& firstname

A genderidentity

A ethnicity

I year

A lowup

A section

' gpa

A extcr

quiz1

Tests

~ Student

Welch

Mann-Whitney

All Hypothesis

0 Group 1 -1- Group 2

Group 1 > Group 2

Group 1 < Group 2

Assumption Checks

Normality

~ Equality of variances

Descriptives

Group Descriptives

Group

final Attended review session Did not allend review session

I~

N

�

�

Dependent Variables

, final

Grouping Variable

A review

Additional Statistics

Location parameter

11n11r1enr int- 0 95.0

~

Effect size

ohen s <'

Glass delta

Hedges g

Confirt~flre er ~I 95

Descriptives

Descriptives plots

Cui fiut IL C a 95.0

Raincloud plots

v zo ,ta ~ spla

Vovk-Sellke maximum ~ratio

Missing Values

%

%

%

O Exdude cases per dependent variable

Exdude cases listwise

Mean SD

0 0 0 0

..

SE Coefficienl of variation

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DAA Section 3: Results and Interpretation

Section 3 asks for descriptive statistics and t-test results. Select Descriptives.

Copy and paste the Descriptives output into DAA Section 3.

• Tests

.Student

Welch

Man n-Wh itn ey

• Tests

.Stu dent

II Welch

Man n-Wh itn e..y

• !Independent Samples T-,l'est .,..

lndepe11 d,ent S.ampl,es T-Test 'f'

ct·· p

final

If the homogeneity assumption is NOT violated, run the “Student” t- test under Tests. Skip to Step 5.

However, if the homogeneity assumption IS violated, run the “Welch” t-test under Tests.

Copy and paste the Independent Samples T-Test output into DAA Section 3.

Below the output:

Report the means and standard deviations for each group.

Interpret the t-test results against the null hypothesis.

e

Ass.umptli on Checks

liest of IEQ. aliW o·· Variarnces (Levene's)

IDescriptiives

Gro up Des,ariplives

fi nal

Group

fi nal Atten-cled review sess ion Did not attend review s,ession

F df,1 df~

� �

Mean

Independent Samples T-Test T

Independent Samples T-Test T

df p

final

DAA Sections 2 and 3 should look like this page.

Testing Assumptions

Report and interpret the Levene’s test.

Results & Interpretation

Report the means and standard deviations for each group. Interpret the t-test results

against the null hypothesis.