Four sororities took a random sample of sisters regarding their grade means for the past term. Their results are below. Using a significance level of 1%, is there a difference in mean grades among the sororities?

Sorority 1

2.17

1.85

2.83

Sorority 2

2.63

1.77

3.25

Sorority 3

2.63

3.78

4.00

Sorority 4

3.79

3.45

3.08