Assumptions of t-Tests

Section 1: Data File Description
1) Provide a context of the grades.sav data set.( I have attached a word document called data set)
2) Include a definition of the specified variables (predictor, outcome) and corresponding scales of measurement. Specify the sample size of the data set.

Section 2: Testing Assumptions
3) Analyze the assumptions of the t test.

Use the following graph to answer question 4

4) Discuss your visual interpretations of the graph output for gpa.

For question 5 use the following table

Descriptive Statistics
N Skewness Kurtosis
Statistic Statistic Std. Error Statistic Std. Error
gpa 105 -.275 .236 -.390 .467
Valid N (listwise) 105

5) Discuss your visual interpretations of the descriptive table. Interpret those values.

Use the table below to answer question 6

Tests of Normality
Kolmogorov-Smirnova Shapiro-Wilk
Statistic df Sig. Statistic df Sig.
gpa .076 105 .162 .972 105 .024
a. Lilliefors Significance Correction

6) Interpret the Shapiro-Wilk test graph of gpa and interpret it.

7) Report the results of the Levene’s test and interpret it. Summarize whether or not the assumptions of the t test are met. To answer this question use the table that is attached in the word document called: BIG TABLE

Section 3: Research Question, Hypotheses, and Alpha Level
8) Articulate a research question related to gender and gpa.
9) Articulate the null hypothesis and alternative hypothesis. Specify the alpha level.

10) Report the results of the table that is attached as a separate document called BIG TABLE. APA guidelines. You will use the table that is in the word document called BOG TABLE. Include the following:
o t.
o Degrees of freedom.
o t value.
o p value.
o Effect size.
o Interpretation of effect size.
o Means and standard deviations for each group. Mean difference.
o Interpret the results against the null hypothesis.
11) Discuss the implications of this t test as it relates to the research question.
12) Conclude with an analysis of the strengths and limitations of t-test analysis.

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