A scatter plot is a graph that plots points "scattered" amongst a Cartesian plain. Their values are assigned by a predictor variable and response variable. If the points are closely correlated enough, a trend line may be appointed for averaging out and purposes of analyzing the trend of the data. For example, this graph shows 10 observed temperatures in degrees Celsius and compares it to the forecast temperatures for the days. The response variable points (y) did show a trend in correlation to the predictor variable (x), so the trend line was drawn. Here there is a positive correlation between observed and forecast temperatures.
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