I am a statistical person, I have learned all about statistics such as mean median mode, standardization, and different test such as the Z test, F test, chi-square. But when I go through the kaggle and other platforms. I hardly find data science projects using the Z test, F test, and chi-square.
I have come across most of the projects using a graphical representation of the plot to calculate the mean median, mode, etc.
My question is are these testing an integral part of data science? If so then, for what sort of problem do we use them?