A researcher selects a random sample of 58 mice from her laboratory. For each mouse, she records the weight of the mouse in grams and whether the mouse prefers Brand A or Brand B food. She would like to know if there is convincing evidence that mouse weight is associated with food preference. Let = 0.10. The observed and expected counts are displayed in the tables.

Observed counts:



Expected counts:



Which of the following contributed the most to the value of the χ2 statistic?

average weight and Brand A
average weight and Brand B
not average weight and Brand A
not average weight and Brand B