test      channel               cost  signups  paid  cost/paid  call
T1        groomer forum rep      400       14     5         80  DOUBLE DOWN
T2        micro creators         840       30     6        140  DOUBLE DOWN
T3        paid social            860       25     3        287  ITERATE
T4        cold email             600        9     4        150  DOUBLE DOWN

By channel:
- groomer forum replies: 1 tests, cost 400, paid 5, cost/paid 80, signup->paid 36%
- micro creators: 1 tests, cost 840, paid 6, cost/paid 140, signup->paid 20%
- cold email: 1 tests, cost 600, paid 4, cost/paid 150, signup->paid 44%
- paid social: 1 tests, cost 860, paid 3, cost/paid 287, signup->paid 12%
