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Trend, scatter and outliers

We look at trend, scatter & outliers, and their use in making predictions from data. After you’ve watched this video, you should be able to answer these questions •How do we use a scatter plot to predict a new outcome at a given value of the predictor variable? •How can we find a range of values that is likely to contain the new outcome? •When will the prediction intervals/ranges be wide and when will they be narrow? •What must we assume when we use existing data to predict a new outcome? •In what type of region is it particularly dangerous to make predictions? •How can we check visually whether a trend line or curve is positioned properly? •What should the trend value corresponding to a particular predictor-variable value (the value 5 was used in the video) be telling us about?