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Kim: Statistical notes for clinical researchers: the independent samples t-test
Open Lecture on Statistics

Restor Dent Endod 2019;44(3):e26.

Published online: 4 August 2019

DOI: https://doi.org/10.5395/rde.2018.44.e26

Statistical notes for clinical researchers: the independent samples t-test

Hae-Young Kim*

Department of Health Policy and Management, College of Health Science, and Department of Public Health Science, Graduate School, Korea University, Seoul, Korea

*Correspondence to Hae-Young Kim, DDS, PhD Professor, Department of Health Policy and Management, Korea University College of Health Science, and Department of Public Health Science, Korea University Graduate School, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea. E-mail: kimhaey@korea.ac.kr

Copyright © 2019 The Korean Academy of Conservative Dentistry

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Figure 1.
Types of 2-sample t-test.
rde-44-e26f1.tif
Figure 2.
The t-distribution with various degrees of freedom (df) compared to z-distribution.
rde-44-e26f2.tif
rde-44-e26f3.tif
rde-44-e26f4.tif
Table 1.
Descriptive statistics and result of the Student's t-test
Group No. Mean Standard deviation p value
1 10 10.28 0.5978 0.004
2 10 11.08 0.4590
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