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[Music] hey welcome back everyone today were going to be talking about a really cool and very very important concept in data science called cross validation now let me just jump into an example actually from my own experience when i was an undergrad i was doing research on students in the mathematics department at my college and the big question we wanted to answer was based on information about the student like we had access to their grades which courses they took their demographic information we wanted to come up with a model that would be able to accurately predict if the student would drop out of their major and what i mean by drop out of their major is switch their major for something else we wanted to identify these students early and then honestly theres a lot of reasons students would drop out of their major sometimes its because their grades are low and they think they would switch to a major where their grades would be better sometimes its not about grades at all sometim