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The population is all the players in the softball league, which is 225 players in total. The sample is the group of 45 players that Maritza chose to ask if they also play basketball.
Population size: 225 players
Sample size: 45 players
Maritza chose 45 players out of 225 to ask about basketball, so she is using this smaller group to make an estimate about the whole league. This way, she can get an idea of how many players in the league also play basketball without having to ask every single player.