For the following description of data identify the Ws specify for each variable whether its use indicates that it should be treated as categorical or quantitative and for any quantitative variable identify the units in which it was measured or note that they were not provided Researchers investigating the impact of training on chess performance collected data from 809 training sessions during 2002 2004 They kept track of the player s age the number of weeks the training lasted the type of training practice theory combined the frequency of training the player had monthly weekly daily the number of wins and sex of the players and whether the players exhibited imnmnuament nona minor mainl Identify the who for the description of data OA The improvement in the chess performance of the 809 players OB The 809 training sessions OC The chess performance of the 809 players OD The 809 players Identify the what for the description of data Select all that apply A Duration of the study C Player s improvement E Frequency of training G Number of training sessions 1 Number of wins of the players Identify the when for the description of data A Between the years 2002 and 2004 CLIED B Average improvement OD Player s age F Type of training H Sex of the players J Duration of the training