 select AVG(ArrDelay) arrivalDelay, absolute_error(arrivalDelay) abs_err, relative_error(arrivalDelay) rel_err, UniqueCarrier carrier from airline
    group by UniqueCarrier
    order by arrivalDelay
-   with error 0.07 confidence 0.95;
+   with error 0.20 confidence 0.80;
 
 -------------------------------------------------------------
 ---- Which Airlines Arrive On Schedule? JOIN with reference table ----

   where airline.UniqueCarrier = airlineref.code
   group by UniqueCarrier,description, Year_
   order by flightRecCount desc limit 10
   with error 0.07 confidence 0.82;

-------------------------------------------------------------
---- Which Airlines Arrive On Schedule? ----

  from airline
  group by Year_
  order by Year_
  with error 0.20 confidence 0.80;
