text: Yo, listen up, y'all, 'bout to drop some knowledge,
  Epidemiological principles, biostatistical techniques, we acknowledge.
  When it comes to research in human populations,
  Gotta follow these methods, no hesitations.
  
  This article's here to break it down for ya,
  Designing valid research, that's the formula.
  Reliable studies, that's what we aim for,
  Analyzing data, gotta explore.
  
  Different study designs, we got 'em all,
  Cross-sectional, cohort, and case-control.
  Sampling techniques, gotta choose 'em right,
  Representative samples, keepin' it tight.
  
  Bias, yeah, it's a hurdle we face,
  Gotta be aware, gotta keep up the pace.
  Sources of bias, they can mess things up,
  Stay vigilant, don't let 'em disrupt.
  
  Statistical tests, we gotta assess,
  Significance, we put 'em to the test.
  T-tests, chi-square, ANOVA, you see,
  Helpin' us determine what's statistically key.
  
  Orthodontists, this one's for you,
  Hope this review helps ya through and through.
  Epidemiology, biostats, now you know the deal,
  Keep learnin' and researchin', let's keep it real.