3. Variable – an attribute or quantity that may have one or many different values Value – the possible outcomes for the variable examples… variable - hobbies values – reading, sports, music variable – number of siblings values – one, two, three

4. Categorical variables – a variable whose values are words Numerical variables – a variable whose values are numbers Examples…. Categorical variables – hair color, favorite holiday Numerical variables – number of pets, number of cars

6. Bar graphs are used to easily compare collected data. Using this type of graph students can see in a “picture” the collected data.

7. All bar graphs need: 1.A Title 2. Axes labeled with names of the two variables 3. Show the values of the variables 4. Need a scale that will accurately display the data

9. Collected data can be also used to show information not collected. This can be done using a point graph. On a point graph the data collected is shown with points. Information can be found by finding where data points meet.

12. An average is a single value that represents a set of numbers. For example, the average grade for a student is the one number that is used to represent all grades in a subject area. The median is the number exactly in the middle of a set of numbers.

13. To find the median the list of numbers must be listed in order from small to large. In a list of numbers where there is an odd number of values, the exact middle number will be the median. EXAMPLE.. In five basketball games John scores 12, 8, 6, 3, and 15 points. Put these numbers in order…. 3,6,8,12,15 8 is the median because it is the exact middle.

14. In a list of numbers where there is an even number of values, find the two middle numbers and determine the middle of those two numbers. EXAMPLE.. After six quizzes Sara as these score, 18,16,14,20. Put these numbers in order… 14,16,18,20 Find the two middle numbers…16,18…determine what is exactly in the middle of those two numbers…. 17 is the median

15. Try this….. On the first five spelling tests Tony received these scores….88,91,75,100,78. What is his median score? Click the box to reveal the solution. 75, 78, 88, 91, 100

16. Try this….. Terry opens six bags of M&M’s. There are 24,33, 22, 18,27,20 M&M’s in the opened bags. What is his median score? Click the box to reveal the solution. 18,20,22,24,27,33 22 and 24 are the middle two numbers. 23 is the median because it is exactly between 22 and 24