{"kind":"user","text":"NIST Statistical Reference Datasets, one-way analysis of variance, problem AtmWtAg: observed data: the atomic weight of a reference sample of silver measured with 2 instruments; one factor (instrument) with 2 levels and 48 observations in a balanced design, model y_ij = mu + tau_i + e_ij. Dataset d holds the factor instrument (levels 1 to 2), the response agwt, and indicator columns instrument_2 (1 when the row is at that level; level 1 is the reference). Compute the ANOVA F statistic for the hypothesis that all 2 instrument effects are equal: the between-instrument mean square divided by the within-instrument mean square."}