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Absolute Value Function Area of a Cylinder Area of a Segment Area of an Ellipse Multiplying and Dividing Radical Terms Equation of a Circle Scientific Notation SumsData in Math, is generally a measurement of some facts.
However, there are different types of data that can be measured or studied.
Along with there being different effective ways to record certain data, such as tally counting.
The two main types of data are QUALITATIVE DATA and QUANTITATIVE DATA.
 Qualitative Data is simply words and descriptions.
 Quantitative Data is numbers.
But as the table above states, this data falls into two categories, discrete and continuous
data.
Each of the data types mentioned can be collected when required, depending on the type of information
you were looking for.
Each type of data could be collected if you had a situation where you were simply asking friends or
family about computer games.
So different questions can ask for different types of data, even about the same subject.
Recording data in a tally chart with tally marks is one of the best methods of collecting data,
particularly quantitative discrete data involving counting.
Say we wanted to count how many people walked a dog through a park.
With tally counting, we start by drawing a small vertical line for each person walking a dog
spotted.
However when we get to a  5th dog walker, this is represented by a horizontal line though the  4 vertical lines written before.
We then continue counting by starting with just single vertical lines again, but do the same
horizontal line with the next fifth dog walker, and so on.
So a total of 17 dog walkers tallied would look like:
The horizontal lines and gaps make the total amount easier to read and keep track of, as opposed to  17 vertical lines:
A tally chart could be used to collect data about a group of peoples favorite drinks.
Drink  Tally  Total 
cocoa   

tea 


coffee 

Tea was the most popular drink among this group.
A stem and leaf diagram is another effective way of collecting and recording data.
Say you wanted to record the ages of a group of 12 employees of a business.
You know in advance that you will have a lot of employees in their 20's, 30's and 40's.
Setting up a stem and leaf diagram is good practice for situations like this.
The ages of the group range from teens to 50's.
A stem and leaf diagram is set up with the first tens digit of each age placed in a left hand
column. This is the stem part.
Then we fill the diagram up, with the units digits of the ages listed in order on the right hand
side.
Each unit for an age is a leaf of each stem, making the leaves of the diagram.
Each row represents the employees aged in teens, 20's, 30's, 40's and 50's respectively.