Transcript Stem-and-Leaf Diagram

Bar Graph
• A bar graph uses vertical or horizontal
bars to display numerical information.
Rt. 896 Road Kill 2006
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25
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Deaths 15
10
5
0
Deer
Skunk
Cat
Squirrel
Animal
Raccoon
Rabbit
Opossum
Pictograph
• A pictograph uses symbols to represent
data. Each symbol has the same value.
Key
= 1 book
Line Graph
• A line graph often shows how data changes
over time. Each point represents an item of
data.
Circle Graph
• A circle graph shows how portions of a set
of data compare with the whole set.The
greater the value of the data, the wider the
wedge that represents the value.
Scatterplot
• A graph that shows paired data. Each point
on a scatterplot represents two data values.
Trend
• A relationship between two sets of data that
shows a pattern is called a trend
Tally Marks
• Tally marks are used to organize large sets of data.
Each mark represents one time that the value
appears in the data. The 5th tally mark is drawn as
a slash to indicate a group of five.
Frequency Chart
• A frequency chart can help you list the data
quickly. Each value that appears in the data is
followed by the number of times it appears.
Line Plot
• A line plot shows the shape of a set of data.
Scale
• The scale of a bar graph is the “ruler” that
measures the heights of the bars.
Interval
• The interval is the amount of space between
the values on the scale.
Range
• The range of a data set refers to the
difference between the highest value and the
lowest value
Horizontal Axis and the Vertical Axis
• The lines on which a bar graph are built are
the horizontal axis and the vertical axis.
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Vertical Axis (y)
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Line 1
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Horizontal Axis (x)
Stem-and-Leaf Diagram
• A graph that shows the shape of the data
according to the data place values. The
“leaf” of a number is usually the right-hand
digit. The “stem” is the remaining digits to
the leaf.
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47
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39
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56
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Median
• The middle value in a data set when the
values are listed from lowest to greatest.
Mode
• One of the values appearing most often in a
data set.
Mean
• The sum of the values in a data set divided
by the number of values.
Outlier
• An outlier is a number in a data set that is
very different from the rest of the numbers.
• An outlier may have a major effect on the
mean.
Double Bar Graph
Double Bar Graph
A double bar graph is similar to a regular bar graph, but gives 2 pieces of information for
each named item, rather than just 1. The bar chart below shows the weight in kilograms
of some fruit sold on two different days by a local market. This lets us compare the sales
of each fruit over a 2 day period, not just the sales of one fruit compared to another. We
can see that the sales of star fruit and apples stayed most nearly the same. The sales of
oranges increased from day 1 to day 2 by 10 kilograms. The same amount of apples
and oranges was sold on the second day.
Amount of fruit purchased over two days
Fruit
Double Line Graph
A double line graph is another way to give a visual representation of the relationship of data that has
been collected. It is similar to the line graph. The difference is there are two lines of data instead of
one.
It is made up of a vertical and horizontal axis and two series of points each one connected by a line.
The legend will show which line represents what set of points. Most times a solid line and a dashed line
are used. But varying colors can also distinguish the two lines apart.
Each point on each line matches up with a corresponding vertical axis and horizontal axis value on the
graph.
In some cases, you are giving a value from the horizontal axis and you need to find its corresponding
value from the vertical axis. You find the point on the line that matches the given value from the
horizontal axis and then match it up with its corresponding vertical axis value to find the value you
are looking for. You would do the same type of process if you were given a vertical axis value and
needed to find a horizontal axis value.
The graph below is a double line graph:
The horizontal axis represents the year and the
vertical axis represents profit in thousands of
dollars.
The legend towards the top of the graph indicates
which line represents which product. The solid
line corresponds with Product A and the dashed
line goes with Product B.