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Transcript of Graphs
Using data displays
We already know how to make data displays.
But how do we use them? And, how do we know
which one to use for certain displays?
Use a line graph
When you need to
show data that
changes over time. Bar Graph Use a bar graph when comparing
categorical data Circle Graph Use a circle graph when showing data that represents part of a whole Stem-and-Leaf Plot Use a Stem-and-Leaf plot when you want
to organize numerical data based on digits. Histogram Use a histogram to compare the frequencies of
numerical data that fall in equal intervals. Box-and-whisker plots Use a box-and-whisker plot to organize numerical data into four groups of approximately equal size. Margin of Error The margin that shows how wrong a survey can be.
If a survey shows that
about 35% people are very afraid of snakes, and about 27% somewhat afraid, the margin of error could be + or - 3%. This would mean that the percent of people who are somewhat afraid could be anywhere between 24%(27-3) and 30%(27+3). It would be the same for those who are very afraid. Between what numbers could the percent of people very afraid be? The margin of error is +or-5.
Would the results change for any of the sections if the percentage numbers were put somewhere else in the margin of error? Remember that in each section, the two percents must equal 100%