The treatment variance is based on the deviations of treatment means from the grand mean, the result being multiplied by the number of observations in each treatment to account for the difference between the variance of observations and the variance of means.
ðə tɹˈiːtmənt vˈɛɹiəns ɪz bˈeɪst ɔnðə dˌiːvɪˈeɪʃənz ʌv tɹˈiːtmənt mˈiːnz fɹʌmðə ɡɹˈænd mˈiːn, ðə ɹɪzˈʌlt bˌiːɪŋ mˌʌltɪplˈaɪd baɪ ðə nˈʌmbɚɹ ʌv ɑːbzɚvˈeɪʃənz ɪn ˈiːtʃ tɹˈiːtmənt tʊ ɐkˈaʊnt fɚðə dˈɪfɹəns bᵻtwˌiːn ðə vˈɛɹiəns ʌv ɑːbzɚvˈeɪʃənz ænd ðə vˈɛɹiəns ʌv mˈiːnz.