1. Measures of center
1.1. Mean
1.1.1. When finding add all the numbers together then divide the sum by the total amount of numbers there.
1.1.1.1. Ex. 1,2,3,4,5,6,6,7 1+2+3+4+5+6+6+7=52 52/8=6.5=mean
1.2. Median
1.2.1. When finding the median line the numbers from least to greatest or greatest to least and find the actual middle number. Once completed you have found the median
1.2.1.1. Ex. 1,2,3,4,4,|5|,5,5,6,7, the median is 5 due to the fact that it is in the middle of all the numbers.
1.3. Mode
1.3.1. When finding the mode you must find the most common number. You can have more than one mode or no mode.
1.3.1.1. Ex. 1,2,2,3,4,5,|6,6,6,6|,7 the mode is 6 since it is the most common number within the line of numbers.
2. Types of data
2.1. Categorial
2.1.1. Categories or Topics
2.1.1.1. Ex. What is your favorite ice cream flavor? Cookies and cream
2.2. Numerical
2.2.1. Quantities: 2,0,3,11,4
2.2.1.1. Ex. How many days have you been to school this week? 5 days
3. Measures of variation
3.1. IQR
3.1.1. When finding the IQR you must find the Q1 Q2 and Q3 before you find the IQR. To find any if that you must line the numbers up from least to greatest. Once you do that you find the median/middle and that's Q2. Next you find the middle number on the left side to find Q1. Lastly you find the middle number on the right side and that's Q3. To find the IQR you subtract Q2 from Q3.
3.1.1.1. Ex. 1,2,|3|,4,5,|6|,7,8,|9|,10,11 Six would be Q2 since it's the median. 9 would be Q3 since it's the middle of the right side. 3 would be Q2. since it's the middle of the left. Then the IQR would be 3 since Q3 is 9 and Q2 is 6, 9-6=3.
3.2. Range
3.2.1. When you find the range of a group of numbers you simply subtract the smallest number from the biggest number
3.2.1.1. Ex. 1,2,3,3,4,5,5,6,7 the range would be 6 because the largest number is 7 and the smallest number is 1 so 7-1=6.