Chapter 12 - Analysis of Variance - 12-1 One-Way Analysis of Variance - Exercises 12-1 - Page 656: 2

See explanation

The three reasons are: 1. The t test assumes that the data is normally distributed, but with multiple groups, this is not always the case. 2. The t test assumes that the variances of the groups are equal, but with multiple groups, this is not always the case. 3. The t test assumes that the groups are independent, but with multiple groups, this is not always the case.