Charlie wants to survey recent customers about the quality of service they received at his small auto service dealership. He has customers' mailing and email addresses. Charlie will likely use an online survey primarily because it offers

answer; /// i believe the correct answer is (when one group has an extremely high score at pretest;

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

answer; the cats meowing will temporarily increase, but then it will decrease;