Statistical Test Selection — NDEB AFK MCQ

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ModerateCommunity Dentistry & EpidemiologyStatistical Test SelectionNDEB AFK

Which statistical test is most appropriate for comparing the mean DMFT scores between two independent groups (e.g., fluoridated vs non-fluoridated communities)?

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Correct answer: B — Independent samples t-test

The independent samples t-test (Student's t-test) is used to compare the means of a continuous variable (DMFT score) between two independent groups (fluoridated vs non-fluoridated community). It tests whether the difference between the two group means is statistically significant. Assumptions include normal distribution and equal variances (or Welch's correction). Chi-square tests compare proportions of categorical variables. ANOVA compares means among three or more groups.

Reference: Burt & Eklund – Dentistry, Dental Practice, and the Community, 7th ed., 2005