CREATE TABLE sampledata15 (sample_pk DECIMAL, state TEXT, year TEXT, month TEXT, day TEXT, site TEXT, commod TEXT, source_id TEXT, variety TEXT, origin TEXT, country TEXT, disttype TEXT, commtype TEXT, claim TEXT, quantity DECIMAL, growst TEXT, packst TEXT, distst TEXT)
CREATE TABLE resultsdata15 (sample_pk DECIMAL, commod TEXT, commtype TEXT, lab TEXT, pestcode TEXT, testclass TEXT, concen DECIMAL, lod DECIMAL, conunit TEXT, confmethod TEXT, confmethod2 TEXT, annotate TEXT, quantitate TEXT, mean TEXT, extract TEXT, determin TEXT)

Tell me the average pesticide residue for each state in the US where food is grown.
SELECT T1.growst, AVG(T2.concen) FROM sampledata15 AS T1 JOIN resultsdata15 AS T2 ON T1.sample_pk = T2.sample_pk GROUP BY T1.growst
SELECT "T1"."growst", AVG("T2"."concen") FROM "sampledata15" AS "T1" JOIN "resultsdata15" AS "T2" ON "T1"."sample_pk" = "T2"."sample_pk" GROUP BY "T1"."growst"