This years water pollution readings at State Park Beach seem to be lower than last year. A sample of 30 readings was randomly selected from this years daily readings:

3.63.93.33.43.83.73.53.63.73.6

3.63.73.93.83.74.03.73.53.83.6

3.53.63.53.73.63.93.93.73.63.5

Researchers want to know if this is sufficient evidence to conclude that the mean of this years pollution readings is significantly lower than last years mean of 3.8.

What are the hypothesis statements?