Please help!

Is there a difference in the amount of airborne bacteria between carpeted and uncarpeted rooms? In an experiment, 7 rooms were carpeted and 7 were left uncarpeted. The rooms are similar in size and function. After a suitable period of time, the concentration of bacteria in the air was measured (in units of bacteria per cubic foot) in all of these rooms. The data and summaries are provided:

Carpeted rooms: 184 22.0 Uncarpeted rooms: 175 16.9

Theapproximatedegrees of freedom for the t-statistc is (Use Option 2/conservative degrees of freedom)

6

7

14

None of the above