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a book club tracked data on how long it takes to read books of different lengths. they counted the number of pages in each book and how long it took to read the book. the reading times were plotted on a graph and then a trend line was fit to the data.
for a 250 - page book (indicated by the arrow), the trend line
- the amount of time it will take to read.
overpredicts
underpredicts
is an exact prediction
Step1: Understand the concept of trend line
A trend line is a line drawn on a scatter - plot to show the general direction of the data points. It is used for prediction. But it is not an exact prediction.
Step2: Analyze the position of the data point relative to the trend line
The data point (the arrow - marked point) is above the trend line. When a data point is above the trend line, the trend line underpredicts the value (in this case, the time).
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underpredicts