What are statistics?        


 Statistics is the science of collecting, organizing , presenting, analyzing, and interpreting data to help in making effective decisions statistical analysis is implemented to manipulate summarized and investigate data so that useful decision-making information results are obtained suppose you are running a business an online cloud selling company and you want to send a campaign to your customers to a certain set of customers you send a campaign to others you don't and you want to know whether the customers are going to buy based on the campaign or not or whether the campaigns were effective or not then how do you design that experiment how do you design whom to send or not to them how do you figure out how many of them to send and once it has happened and suppose the customers who got the advertisement clicked on it and purchased a little more as compared to the customers who did not get the advertisement now how do you establish that even if the advertisements are not sent to the customer would have still bought those particular set of customer would have still got more to answer all these questions we do statistics so there are two kinds of statistics one is descriptive statistics and the other is inferential statistics descriptive statistics is a method of organizing summarizing and presenting data in the information way you have all the data you know like how your business has been going on how much inventory you keep how many customers come to your store in which month has it been more on what day of the week it occurs more which product is usually sold more at what point in time on what are is your product sales more what kind of customers come is it like female customers come more at this point of time or male customers come at more this point of time people, its children come more figured buyers come more bear buyers come more grocery items buyers come more all these questions based on data are answered by descriptive statistics as opposed to inferential statistics which is a different kind of statistics altogether recently we had an election in a state now you're not going to ask every person whether they voted for one party or the other but you want to figure out so you select a sample you decide the sample size and based on that sample the size you try to infer which party is going to get more votes you try to infer whether a person is lying or telling the truth so that becomes inferential statistics so the population, in that case, would be all the individuals that say Gujarat where people voted and the sample would be those people to whom you went and asked hey are you going to vote for party a or are you going to vote for party B a cat killed on average is dead.