Why is it important to learn statistics in the study of Psychology?

In all the sciences, it is necessary to gather & compare data, isolate & control variables, interpret results, and prove or disprove hypotheses. In the case of sociology & psychology - as Courtney mentioned - one will often show correlation between test
variables. Statistics is the study of mathematical comparison of scientific variables, so you will learn about types of variables, types of data, types of comparisons, methods of interpretation, and a wonderful tool called the normal curve. All these & more
make it possible for psychologists to discover what we can & cannot expect in terms of human behavior, development, etc. Without statistics, it is just a bunch of messy guess work, and, as a psychology student, you must learn how psychologists & sociologists
use statistics in their studies & reports. good luck!