題組內容

7. (10%) In an experiment to investigate the performance of four different brands of tires for 125-cc motorcycles, five tires of each brand were tested and number of miles until failure was observed. A partially completed ANOVA table is given:

(b) \( (3\%) \) At the \( \alpha = 0.05 \) level of significance, test whether the average number of miles until failure for the four different brands of tires are equal.