Video

Line of best fit: smoking in 1945 (Full video)

Khan Academy

Supporting grades: 8

Description: Sal estimates the percentage of American adults who smoked in 1945 using a scatter plot. Created by Sal Khan. Assuming the trend shown in the data has been consistent since 1945, use the graph to estimate the percentage of American adults who smoked in 1945. So at this point right over here, this is 0 years since 1965. And we see it looks like it's around 42% of Americans, just looking at this graph.

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