Please help with this! Thank you, will upvote immediately.

We are proving a digital sign outside our company restaurants see which option would work out in terms of drawing in more customers than the standard outdoor signage.

For the test, daily customers at 12 restaurants for one week using the standard signage, and then we also count the customers at these same 12 restaurants for one week with the new digital signage. *Assuming the daily restaurant attendance is distributed normal and that distribution doesn't vary from day to day.*

Determine the degrees of freedom here:

1. 11

2. 22

3. 24

4. 12