[Verse 1] Oh you wanna know if your test is strong If it holds its ground or just plays along Classical test theory It’s the OG tune Observed equals true plus error in the room [Prechorus] We break it down Split it in half Check the halves Are they having a laugh Test-retest Let time play its part Same song tomorrow Does it sound smart [Chorus] Reliability Oh can we trust Cronbach’s alpha It’s a must McDonald’s omega A newer friend Testing together until the end [Verse 2] Assumptions of CTT Keep ‘em in mind Errors uncorrelated True scores aligned Equal variance The ground we tread Stats aren’t magic They’ve rules instead [Prechorus] We break it down Split it in half Check the halves Are they having a laugh Test-retest Let time play its part Same song tomorrow Does it sound smart [Chorus] Reliability Oh can we trust Cronbach’s alpha It’s a must McDonald’s omega A newer friend Testing together until the end [Bridge] Internal consistency, it lights the way Alpha or omega, guiding every day The rule of thumb, greater than 0.90 to trust For decisions that are sharp, it's a must For research exploration, 0.70 will do Consistent scores ensure it's all true [Chorus] Reliability Oh can we trust Cronbach’s alpha It’s a must McDonald’s omega A newer friend Testing together until the end
