I plan to start a series of tutorials in Data Analysis and SQL and it all starts with introduction to statistics as follow ..
ًWhat is statistics ?
Statistics is a science (close to and uses mathematics) with huge interest of understanding and learning from data, specially big amount of data.
Activities in statistics science include collecting, organizing, analyzing and interpreting data, making inferences, probabilities and expectation from data.
Why do we study statistics ?
The main big reason is that it helps us in decision making bY answering important questions, producing results (conclusions) or predicting information that we can build trustable decision over it.
Let me give you some beautiful insights about what statistics do for us.:
- If we have marks of Math for students in a classroom. Knowing 1 value in statistics called “range” can tell you that between all students there is no mark greater than any other mark in the class with value more than 5. This can give you better understanding of your students marks that marks are close to each others enough.
- With statistics you can predict the price of your house based on information about prices in the area of other houses that have some common/different attributes
- If we have data about salaries of all people in a city. Statistics can tell you that 75% of salaries in the city lies between 1000 and 1500 so if you are going to price your product it should fit in that range.
- In telecommunication, If you have data about people calls and duration, statistics can give you information like those segment of customers always spend more than 1000 minutes per week. You can use this to make special marketing package for them with better price to guarantee their loyalty.
Those are tiny examples of what statistics can do for us. There are much much more. Specially in the inferencing/predicting part. Take for example giving the probability of some disease for some person, or predicting student marks in an exam based on previous indicator.
I hope you got the sense of what statistics is and what it can do for us. Next part we start digging in.