ðɪs stˈʌdi wʌz bˈeɪst lˈɑːɹdʒli ɔnðə ɹˈeɪʃɪˌoʊ ʌv ɐdvˈænst plˈeɪsmənt ɔːɹ ˌɪntɚnˈæʃənəl bˈækɐlˌɔːɹiːˌeɪt tˈɛsts tˈeɪkən tə ðə nˈʌmbɚɹ ʌv ɡɹˈædjuːˌeɪɾɪŋ hˈaɪ skˈuːl sˈiːnjɚz.
This study was based largely on the ratio of Advanced Placement or International Baccalaureate Tests taken to the number of graduating high school seniors.