Matt and Kim will meet one another at the movies I hope that it makes sense to you
The research error described above is an example of selection bias.
Selection bias takes place when, from a population of interest, a group of individuals is selected in order to construct a sample but without a proper randomization. The result is a sample which is not representative of the underlying population.
According to the example, the target population of the research comprises all students but the sample only includes boys. Hence, selection has not been random because it followed a gender criteria, and the results obtained using it cannot be applicable to the whole population because they are affected by a selection bias.
So slavery and trapping of other tribes was already a thing in Africa before slavery went to the U.S. Because the U.S started doing it, tribes now wanted to enslave as many people as they could to get money from trades that would se d slaves over. This meant tribes fell apart, cultures were lost, and people were hunted down to sell as slaves.
