In this situation, the population refers to all the players in Maritza's softball league, which includes a total of 225 players. This is the entire group that Maritza is interested in studying to find out how many of them also play basketball. The sample is the smaller group that Maritza actually talked to, which consists of 45 players she randomly chose from the larger population.
To find the size of the population, we simply look at the total number of players in the league, which is 225. To find the size of the sample, we count the players Maritza selected to ask about basketball, which is 45.
In summary, the population is all 225 players in the softball league, and the sample is the 45 players Maritza asked about their basketball participation. The size of the population is 225, and the size of the sample is 45.