Finding mean, median, mode, and range...

VOCAB!

-As you can see from the image above, I have the vocabulary words.  I like this picture because it's a great print out for the classroom, and is super cute!!! I am however going to go and list my definitions as well.

Mean: also known as the average.  To get the average you add all the data together then divide the sum by the number of data given.  

Median: is the middle.  If you don't have a middle number you add the two numbers in the middle of your data and divide by 2.  You do however, need to make sure that your data is in least to greatest order. 

Mode: this is the data that occurs most frequently.

Range: is the difference between the smaller and biggest number of the data.

How did she get the mean?

-You add up all the data then divide by the number of data given.  

-Total data given: 9  

*13+13+13+13+14+14+16+18+21=135  

-Now take 135 and divide it by 9  

*135/9=15

What about mode?

-You can have more than one mode.  If 14 was repeated 4 times, like 13 is, then you would have two modes. 

How did she get the range?

-The range is the Biggest number subtracted by the smallest number.

21-13=8

All About That Graph

-An important part of displaying data are visual illustrations.  These visual illustrations are different types of graphs.  Graphs such as: pictographs, circle graphs, pie charts, dot plots (also known as line plots), scatter plots, stem and leaf plots, frequency tables, histograms, bar graphs, and line graphs. 

-First lets take a look at some vocabulary you will see. 

            -Categorical Data: data that represents characteristics of object or individuals in groups.

            -Numerical Data: Data collected on numerical variables.

            -Pictographs: used to represent tallies of categories.

                               

-Dot Plots/Line plot: provide a quick simple way to organize data.  Only use them when there is only one group of data and have less than 50 values.

                                    -Outlier: a point whose value is significantly greater than or less than others.

                                    -Cluster: Isolation group of point

                                    -Gap: large space between data points

                                    -Mode: Data value3s hat occur the most often

                                             

            -Stem and Leaf Plot: a display where the data is organized by place value.

                         

            -Grouped Frequency Table: Shows hoe many times data occurs in a range.

                                       

            -Histogram: Compare number of data items grouped in numerical intervals.  Order does matter.

                                     

            -Bar Graph: Compare number of data in grouped categories.  Order doesn’t matter.

                                         

            -Circle Graphs: Circular region partitioned into sections.  Each section equals a part or percentage of the whole.

                                           

            -Line Graphs: Consecutive data points are connected by line segments.

                                            

            -Scatter Plots: Relationship between variables cannot be depicted by a broken line.