Essentials of Statistics in Dental Research: Part 2.

The Part 1 of essentials of statistics in dental research covered topics on statistical concepts that are often mentioned in checklist of many peer-review journals including, study design, hypothesis testing, significance level and confidence interval, effect size, and sample size and power. The Part 2 of the series covers another set of important topics in dental statistics including, levels of measurements, tests of normality, and tests of statistical significance. Appropriate use of statistical methods is becoming increasingly important in dental research as many well-established journals have Statistical Committee to examine the methods used in analyzing data. The aim of this paper was to explain how to select the correct statistical test and outline some of the most commonly used statistical tests found in the dental literature.