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How to proof whether we doubled it or we add it by one. watch

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    We performed a mock experiment how hear rate is affected by resistance of riding a bike.
    We measured heart rate against resistance (mass) .

    We measured the heart rate (dependant vairable ) for 0kg 1kg and 2kg.

    However for the next one we are in a dilemma. Halve of our group says we done 4kg and the other halves says we done 3kg ,my self included .

    Apparently their argument for doing 4kg was this " So we doubled it each time. From 1 to 2 and then 2 to 4."

    If we did do 4kg the when we draw a the graph then we should expect it to be a exponential graph . Correct?

    If not then it should be linear .

    If there is a way to determined whether we doubled it please let me know.

    Thank you.
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    This would need to be wrote up in your evaluation as you can’t say whether it would be linear or exponential without graphing. Going up in 1kg increments could still give you an exponential, and going from 1kg to 2kg to 4kg could give you a linear line, your biggest problem with the 4kg is that once plotted you have to assume what it would have been for 3kg in order to draw a line so looking at the points on your graph would the 3kg of caused a linear line or an exponential line on your graph for 4kg... and there’s your weakness you are now assuming how it would have reacted for 3kg and so drawing your line of best fit under assumption.
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