Testing one factor at a time hides interactions, but produces apparently inconsistent experimental results.
tˈɛstɪŋ wˈʌn fˈæktɚɹ æɾə tˈaɪm hˈaɪdz ˌɪntɚɹˈækʃənz, bˌʌt pɹədˈuːsᵻz ɐpˈæɹəntli ɪŋkənsˈɪstənt ɛkspˌɛɹɪmˈɛntəl ɹɪzˈʌlts.