How can I tell if data are numerical

How can I tell if data are numerical or categorical? Numerical Data: Quantitative data is data that can be measured or identified on numerical scale -how often -how many Categorical Data: Categorical variables represent types of data which may be divided into groups

Vocabulary you will need: • Frequency: How often something happens in a given time. • Frequency table (distribution): is a table that shows the number of times an event, action, value or characteristic occurs • Tally Marks: A set of five lines used to keep track of the number of something when counting.

Stem and Leaf • Define: In a stem-and-leaf plot each data value is split into a "stem" and a "leaf".

Line Plot • Define: A line plot involves frequency of numerical data. It is a number line with X's located above the occurring numbers.

Pictograph • Graph that uses symbols to represent data.

Bar Graph • A graph drawn using rectangular bars to show large each value is.

Line Graph • A line graph is a graph used to show change over time!!

Histogram • bar graph that shows how frequently data occur within certain ranges or intervals.

Mean Definition: Sum of all data divided by the number of items in the set Example: 2, 4, 1, 1, 2 Mean: 2+4+1+1+2= 10 10/5 = 2

Median • Definition: middle number • Example: 1 2 2 3 4 5 6 7 8 8 8 10 10 Median: 6 Example: 1 2 3 4 5 6 6 6 Median: 4+5=9 9/2= 4. 5

Mode • Definition: most repeated number • Example: 1, 2, 2, 2 , 2, 4, 5 , 6, 7, 7, 7, 8, 9 Mode: 2

Range • Define: difference between the high and the low • Example: 1, 2, 4, 5, 6, 6, 7, 8, 20 Range: 20 -1= 19

Label the following graphs use your definitions