Dak Prescott has the highest completion percentage by a rookie quarterback, at 67.8 percent in 2016.

who has the best qb completion% by a rookie qb in a season
Interpreted as:
Who has the best qb completion% with a minimum of 14 passing attempts per team game by a rookie qb in a season?
2016Prescott2020Herbert2004Roethlisberger2012Griffin2020Burrow2014Bridgewater2019Murray2018Mullens2020Tagovailoa2012Wilson2018Mayfield2014Davis2016Wentz2015Mariota2019Jones2008Ryan2004Palmer2012Foles2019Minshew2008Flacco2010Bradford1999Garcia2011Newton67.866.666.465.665.364.464.464.264.164.163.863.462.462.261.961.160.960.860.660.060.060.060.0
NAMESEASONTMGPPCTCMPATTYDSAVGYDS/GTDTD%INTINT%SCKSCKYRATE
Dak PrescottDak Prescott2016DALDAL1667.83114593,6678.0229.2235.040.925143104.9
Justin HerbertJustin Herbert2020LACLAC1566.63965954,3367.3289.1315.2101.73221898.3
Ben RoethlisbergerBen Roethlisberger2004PITPIT1466.41962952,6218.9187.2175.8113.73021398.1
Robert Griffin IIIRobert Griffin III2012WASWAS1565.62583933,2008.1213.3205.151.330217102.4
Joe BurrowJoe Burrow2020CINCIN1065.32644042,6886.7268.8133.251.23223189.8
Teddy BridgewaterTeddy Bridgewater2014MINMIN1364.42594022,9197.3224.5143.5123.03924985.2
Kyler MurrayKyler Murray2019ARIARI1664.43495423,7226.9232.6203.7122.24830987.4
Nick MullensNick Mullens2018SFSF864.21762742,2778.3284.6134.7103.61712790.8
Tua TagovailoaTua Tagovailoa2020MIAMIA1064.11862901,8146.3181.4113.851.72013687.1
Russell WilsonRussell Wilson2012SEASEA1664.12523933,1187.9194.9266.6102.533203100.0
Baker MayfieldBaker Mayfield2018CLECLE1463.83104863,7257.7266.1275.6142.92517393.7
Austin DavisAustin Davis2014STLSTL1063.41802842,0017.0200.1124.293.22917985.1
Carson WentzCarson Wentz2016PHIPHI1662.43796073,7826.2236.4162.6142.33321379.3
Marcus MariotaMarcus Mariota2015TENTEN1262.22303702,8187.6234.8195.1102.73825891.5
Daniel JonesDaniel Jones2019NYGNYG1361.92844593,0276.6232.8245.2122.63829587.7
Matt RyanMatt Ryan2008ATLATL1661.12654343,4407.9215.0163.7112.51710487.7
Carson PalmerCarson Palmer2004CINCIN1360.92634322,8976.7222.8184.2184.22517877.3
Nick FolesNick Foles2012PHIPHI760.81612651,6996.4242.762.351.92013179.1
Gardner MinshewGardner Minshew2019JAXJAX1460.62854703,2717.0233.6214.561.33318491.2
Joe FlaccoJoe Flacco2008BALBAL1660.02574282,9716.9185.7143.3122.83227680.3
Sam BradfordSam Bradford2010STLSTL1660.03545903,5126.0219.5183.1152.53424476.5
Jeff GarciaJeff Garcia1999SFSF1360.02253752,5446.8195.7112.9112.91510477.9
Cam NewtonCam Newton2011CARCAR1660.03105174,0517.8253.2214.1173.33526084.5
Dieter BrockDieter Brock1985RAMRAM1559.72183652,6587.3177.2164.4133.65135182.0
Mitchell TrubiskyMitchell Trubisky2017CHICHI1259.41963302,1936.6182.872.172.13119677.5
StatMuse has season-level data for completion percentage and pass attempts per team game going back to the 1932 season.

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