There are 20 people at a chess club on a certain day. They each find opponents and start playing. How many possibilities are there for how they are matched up, assuming that in each game it does matter who has the white pieces (in a chess game, one player has the white pieces and the other player has the black pieces)

STAT 110 – Notes for Week of 8/23/16 Chapter 2 o When collecting data, the sample should represent the population since it is selected from the population. o Bias: when data is consistently skewed in one direction. Personal choice inevitably produces bias. o Some sampling designs are biased by nature;...