Four brands of cereal are compared to see if they produce significant weight gain in rats. Four groups of seven rats each were given a diet of the respective cereal brand. At the end of the experimental period, the rats were weighed and the weight was compared to the weight just prior to the start of the cereal diet.

Determine whether each brand has a statistically significant effect on the amount of weight gain. The data are provided in the table below.

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Brand A (weight gain in oz) 9 7 8 8 7 8 8 Rat Weight by Brand of Cereal Brand B Brand C Brand D (weight gain in oz) (weight gain in oz) (weight gain in oz) 5 4 2112232 64573 2 3 859278 8