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    Use the data in your table to plot a fully-labelled graph to show the effect of increasing caffeine concentration on the mean heart rate of Daphnia. Plot range bars on the graph.


    I labelled and plotted all the values correctly but I drew a line of best fit:confused:
    So how do I know when to draw a line of best fit graph?
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    What you drew is just connecting the points. A line of best fit is when you are expecting a linear relationship and you roughly go through the points taking the best route so that your points are either slightly above or below the line. Your data does not appear to show a nice linear relationship. But maybe if you pick out a result likely to be an anomalous result, maybe the 100% caffeine?
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    (Original post by alkyone)
    What you drew is just connecting the points. A line of best fit is when you are expecting a linear relationship and you roughly go through the points taking the best route so that your points are either slightly above or below the line. Your data does not appear to show a nice linear relationship. But maybe if you pick out a result likely to be an anomalous result, maybe the 100% caffeine?
    No, this from the answers book.

    I drew a line of best fit, but in the answers book it connected all the points, so my question was how am I supposed to know when to draw a line of best fit or connect all the points together?
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    Ohh sorry. Well if it doesn't tell you to draw one, since your points don't have a visibly linear relationship, you cannot assume that the heart beat is supposed to rise steadily with caffeine concentration, so you just connect your points
 
 
 
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