Unit 9 - Data Distribution
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Learning Outcomes
• Collect, organize, and represent data in circle graphs • Make observations and inferences about data represented in a circle graph • Compare data represented in a circle graph with the same data represented in bar graphs, pictographs, and line plots • Determine the effect on measures of center when a single value of a data set is added, removed, or changed • Define measures of center as mean, median and mode • Use a number line to show mean as a balance point • Define mean as a balance point |
Essential Questions
•How do the data collected influence how we represent and interpret the data? • How does the shape of the data help you draw conclusions about the data? • Why are different measures of center used to describe a set of data? |
Vocabulary
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measures of center
mean median mode range |
data
balance point percentage average |
ling graph
circle or pie graph bar graph pictograph line plots |
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Measure of Center
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Measures of center generally tell us about the middle, or center, of a distribution.
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Mean/
Average |
The mean, or "average", is calculated by adding all the data values and dividing by the number of values.
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Median
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the median is the value that is in the middle of the arranged/ordered set. Half of the numbers in the set are above the median and half are below the median.
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Mode
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The mode is the most frequently occurring data value.
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Range
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the difference between the lowest and highest values.
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Data
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A collection of facts, such as numbers, words, measurements, observations or even just descriptions of things.
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Balance Point
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the point on a number line where the data distribution is balanced.
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Percentage
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A percent is a ratio whose second term is 100. Percent means parts per hundred.
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Types of graphs
Pictograph
Bar Graph
Circle or Pie Chart
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Line Graph
Line Plot Graph
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