![]() Sum of all the numbers divided by- this is a human-constructedĭefinition that we've found useful- the sum ofĪll these numbers divided by the number of This, we call it arithmetic, arithmetic mean. People talk about hey, the average on this exam The average, that's somehow typical, or middle, To represent these with one number we'll call So once again, you haveĪ bunch of numbers. Give me a typical, or give me a middle number,Īn attempt to find a measure of central tendency. Terminology, average has a very particularĪbout the arithmetic mean, which we'll see shortly. How can we do it? And we'll start by thinking That somehow represents the center of allĭone the same things that the people who first came How can I find something that- maybe I wantĪ typical number. How would you do that? Well, you'd say, well, Have one number that represents all of theseĭifferent heights of plants. Said- in another room, not looking at your And the heights are 4 inches,ģ inches, 1 inch, 6 inches, and another one's 1 inch,Īnd another one is 7 inches. ![]() ![]() The way, let's think about how we can describe data. Of inferential statistics, make inferences. Inferences about that data, start to make conclusions, With a smaller set of numbers? So that's what we're Of data, and if we want to tell somethingĪbout all of that data without giving themĪll of the data, can we somehow describe it Into the world of statistics, we will be doingĪ lot of what we can call descriptive statistics. To understand or get our head around data. Into the world of statistics, which is really a way But if we remove one of the ones, since every number would be represented equally, there would be no mode. For example, in the set of numbers from earlier (1, 1, 3, 4, 6, 7), the mode would be 1. Rule: If all the numbers are represented equally (basically if there are the same amount of each number, if that makes sense,) there is no mode. Mode: The most common number in a set (the number that repeats itself the most). We add them together to get 7, then divide it by 2 to get a median of 3.5.) However, this DOES NOT apply to a set of numbers with an odd set of numbers in it. (In the set of numbers we had earlier, 3 and 4 were the middle numbers. Then you divide them by two to get the median. Rule: When faced with a set of numbers where the amount of numbers in it are all even, you take the two middle numbers and add them. Statistics: the study and manipulation of data (basically it's just data)ĭescriptive statistics: Showing data while summarizing or using a smaller set of numbers.Īverage: (these are just words to describe average) In general, mean, typical, middle, central tendency.Īrithmetic mean (or just mean, I just like arithmetic mean more): The process of adding a set of numbers, then dividing by the amount of numbers.
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