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**One Variable vs. Two Variable Data**

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One Variable Data One-variable data sets give measures of ONE ATTRIBUTE.

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Some Examples…….

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**You can recognize one-variable situations when you see:**

Tally charts Frequency tables Bar graphs Histograms Pictographs Circle graphs

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Two Variable Data Two-variable data sets give measures of two attributes for each item in a sample.

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Some Examples…….

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**You can recognize two-variable situations when you see…..**

Ordered pairs Scatter plots Two-column tables of values

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**One OR Two Variable Data?**

Noah researches annual hours of sunshine in Canadian cities A study compared the length of time children spend playing video games and the time they spend reading

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**Fill in the blanks…… As population of a city increases, increases.**

decreases. As temperature increases,

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EXAMPLE 1 Describe the correlation of data Describe the correlation of the data graphed in the scatter plot. a. The scatter plot shows a positive correlation.

EXAMPLE 1 Describe the correlation of data Describe the correlation of the data graphed in the scatter plot. a. The scatter plot shows a positive correlation.

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