Free practice · boolean · easy
Practice
Separate association from causation
If two metrics increase together, one must have caused the other.
Customer survey · evidence boundary
High respondent satisfaction does not erase low response
- Invited
- 400 Targeted customers
- Responded
- 40 Observed sample
- Satisfied
- 32 80% of respondents
Survey response rate10%
The 80% satisfaction result describes the 40 respondents. Nonresponse may make them different from all 400 invited customers.