Dependent t-Test
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Dependent t-Test - Statistical Analysis - Lecture Slides, Slides of Statistics
Statistical Analysis is helpful in many fields of science. This course was taught to Law students to help them analyzing different cases. Key points in this lecture are: Dependent T-Test, Independent Variable, Dependent Variable, Target Population, Null Hypothesis, Alternative Hypothesis, Statistical Technique, Decision Rule, Results Section, Paired Samples Test
Typology: Slides
2012/2013
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Dependent t-Test
When to Use a Dependent t-Test
- Two Dependent (related) Samples
- Repeated-Measures Design (before-after)
- Matched-Subjects Design
Example of a Dependent t-Test --
continued
- Number of Samples: 2 (before & after)
- Nature of Samples: dependent (same subjects at two different points in time)
Example of a Dependent t-Test --
continued
- Independent Variable: participation in boot camp--exercise
- Dependent Variable and its Level of Measurement: number of pull-ups (ratio)
- Target Population: boot camp participants
Example of a Dependent t-Test --
continued
- Obtained Test Statistic: t
- Decision: accept or reject null hypothesis
- D.f. = n-
(in this case n – 1 = 25 – 1 = 24
Results Section
- The results of the Dependent t-Test involving participating in a physical exercise program as the independent variable and number of pull- ups as the dependent variable were not statistically significant.
SPSS Paired-Samples t-Test Procedure
- Analyze, Compare Means, Paired-Samples t- Test
- Move pair of variables over to Paired Variables
SPSS Paired-Samples t-Test Sample
Printout
Paired Samples Statistics Pair 1 Score on Drink Index Score on Drug Index^ Mean 26.25 13.10^ N^2020 Std. Dev iation14.64613.924 3.2753. Std. Error Mean
Paired Samples Correlations Pair 1 Score on Drink Index & Score on Drug Index^ N^20 Correlation.783^ Sig..
Paired Samples Test
Pair 1 Score on Drink Index - Score on Drug I ndex 13.15 9.444 2.112 8.73 17.57 6.227 19. Mean Std. Dev iat ion^ Std. Error Mean Lower Upper
95% Conf idence Interv al of the Dif f erence
Paired Dif f erences
t df Sig. (2-tailed)
SPSS Paired-Samples t-Test Printout --
continued
- Paired Samples Correlations
- Paired variables
- N
- Correlation
- Sig
- p-value of correlation coefficient
SPSS Paired-Samples t-Test Printout --
continued
- Paired Samples Test
- Paired variables
- Paired Differences
- Mean of the Difference
- Standard Deviation of the Difference
- Standard Error of the Mean of the Difference
- 95% Confidence Interval of the Difference
- Lower
- Upper