Destiny concluded that her new white noise machine helped her fall asleep last night. She based this conclusion on personal experience, which might have confounds. In this context, a confound means:

Another thing might have also occured last night to help destiny fall asleep

Explanation: Destiny concluded that her new white noise machine helped her fall asleep last night. She based this conclusion on personal experience, which might have confounds.However, In this context, another thing might have also occured last night to help destiny fall asleep

answer; inductive techniques;

citizens were able to charge more for their goods and services