The first printing press. Before 1440 only a few thousand handwritten texts existed across Europe.
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.
Answer: The Caste System
Explanation:
system of social inequality in which people's status is permanently determined at birth based on their parents' ascribed characteristics.
APARTHEID: Policy of racial segregation placed in the Republic of South Africa.
True, the school environment must be the same for everyone
