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`@@ -56,6 +56,27 @@ Types of Data:`
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`58`	`58`	`# 2. Variable and it's Types`
	`59`	`+#### What is variable?`
	`60`	`+A variable in algebra represents an unknown value or a value that varies.`
	`61`	`+`
	`62`	`+#### Types of Variables:`
	`63`	`+##### 1. Categorical Variable:`
	`64`	`+Variable that can be put into categories. For example, male and female are two categories in a Gender.`
	`65`	`+`
	`66`	`+##### 2. Control Variable:`
	`67`	`+A factor in an experiment which must be held constant`
	`68`	`+`
	`69`	`+##### 3. Confounding Variable:`
	`70`	`+Extra variables that have a hidden effects on your experimental results`
	`71`	`+`
	`72`	`+##### 4. Dependent Variable (Output Variable):`
	`73`	`+The outcome of an experiment`
	`74`	`+`
	`75`	`+##### 5. Independent Variable (Input Variable):`
	`76`	`+A variable that is not affected by anything`
	`77`	`+`
	`78`	`+`
	`79`	`+`
`59`	`80`
`60`	`81`	`# 3. Sample and Population`
`61`	`82`

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