# PSY 7864 Quant Design and Analysis

Assignment Instructions_u06a1

T-TEST APPLICATION AND INTERPRETATION

Complete the following for this assignment: (files have been downloaded separately for accessibility)

• For this assignment, you will use the Data Analysis and Application template (DAA Template [DOC]).
• For help with SPSS, refer to IBM SPSS Step-by-Step Guide: t Tests [DOC].
• For information on the data set, you may find the Data Set Instructions [DOC] helpful.
• Refer to the 7864 Course Study Guide for information on analyses and interpretation.

The grades.sav file is a sample SPSS data set. The data represent a teacher’s recording of student demographics and performance on quizzes and a final exam across three sections of the course. Each section consists of 35 students (N = 105). There are 21 variables in grades.sav.

This week’s assignment is on t-tests. You will analyze the following variables in the grades.sav data set:

 SPSS Variable Definition Gender female = 1; male = 2 GPA previous grade point average

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##### Step 1: Write Section 1 of the DAA: The Data Analysis Plan
• Name the variables used in this analysis and whether they are categorical or continuous.
• State a research question, null hypothesis, and alternate hypothesis for the independent samples t-test.
##### Step 2: Write Section 2 of the DAA: Testing Assumptions

Test for one of the assumptions of t-tests – homogeneity of variance.

• Create SPSS output showing the Levene’s Test for Equality Variances. Run the Levene’s test on the dependent variable test for the entire sample. Do not split the data up by gender before running the homogeneity test.
• Paste the table in the DAA.
• Interpret the Levene’s test.
##### Step 3: Write Section 3 of the DAA: Results and Interpretation

Paste the SPSS output of the t test. Below the output:

• Report the means and standard deviations for each group.
• State the results of the t-test using the “Assume equal variances” row.
• Interpret the statistical results against the null hypothesis and state whether it is accepted or rejected.
##### Step 4: Write Section 4 of the DAA: Statistical Conclusions
• Analyze the limitations of the statistical test and/or possible alternative explanations for your results.
##### Step 5: Write Section 5 of the DAA: Application
• Name an independent variable and dependent variable that would work for such an analysis and why studying it may be important to the field or practice.

Submit your DAA template as an attached Word document in the assignment area.

References:

George, D., & Mallery, P. (2019). IBM SPSS statistics 25 step by step: A simple guide and reference (15th ed.). Routledge.

• Chapter 11 describes how to run a t test in SPSS.

Field, A. (2018). Discovering statistics using IBM SPSS: North American edition (5th ed.). Sage.

• Review Chapter 10’s information on t test assumptions and comparing independent means to help you with your assignment.

The 7864 Course Study Guide [PDF] highlights content to focus on as you read and absorb the materials. You may also find some additional articles with direct relevance to your field here.

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