We ask in df: "Do you sleep more than 8 hours?"
We want to take only "yes" answers:
sleep8 = data["sleep"]
yes = sleep8 == 'yes'
print(yes)
0 False
1 False
2 False
3 False
4 False
...
390 False
391 False
392 False
393 False
394 False
Then I need to take only True answers.
How do I do that?