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erin512 Group Title

What is the most misleading aspect of this graph that might lead one to the wrong conclusion? connecting the data points with a line scale of the y-axis scale of the x-axis spacing of the grid (graph attached)

  • one year ago
  • one year ago

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  1. erin512 Group Title
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    • one year ago
  2. JocelynC Group Title
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    I'm not sure what it means by "scale of the y-axis," but it's a little confusing that it starts off at .45 seconds instead of zero. So in that, I would select spacing of the grid. Don't take my word for it; it is between B and D.

    • one year ago
  3. erin512 Group Title
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    thanks :)

    • one year ago
  4. blues Group Title
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    It is quite confusing that the Y axis starts at some number other than zero. Without a couple dashes in it drawing attention to the discontinuity.

    • one year ago
  5. erin512 Group Title
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    hm i'm not sure

    • one year ago
  6. Shane_B Group Title
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    I personally would go with "connecting the data points with a line" and I'll explain why: Four discrete points are plotted which implies that measurements were only taken at those points. Adding lines to this graph implies that many more measurements were taken which contradicts the fact that only 4 measurements were taken.

    • one year ago
  7. erin512 Group Title
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    thank you so much :) can you help me with one more i'm posting now?

    • one year ago
  8. blues Group Title
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    I am not in love with connecting the data points either - but I thought they might be OK in this case because measurements are on the same spring. Presumably the spring stretches through all the intermediate points (i.e., the ones on the line) to reach the conformations it's in when it's measured.

    • one year ago
  9. Shane_B Group Title
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    I guess that could be true but the restoring force of a string is not linear:\[F=-kx^2\]

    • one year ago
  10. Shane_B Group Title
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    err *spring

    • one year ago
  11. Shane_B Group Title
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    Ooops...that should have been: \[F=\frac{1}{2}kx^2\] :)

    • one year ago
  12. erin512 Group Title
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    so is that answer correct?

    • one year ago
  13. blues Group Title
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    **Agrees** No professional person in their right mind would draw lines through those data points. But the labeling on the Y axis is also lousy. I guess the bottom line is there is much wrong with this picture and it's a subjective decision what's worst.

    • one year ago
  14. erin512 Group Title
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    thank you :) i see now

    • one year ago
  15. Shane_B Group Title
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    One sec...let me explain that a bit better. |dw:1358133711277:dw| Drawing the lines in the first graph implies that if you take any point on the line that's where the displacement will be given a pendulum with that period. Now look at the second graph...which could just as easily be the true graph of some spring. Clearly using the graph with the lines is going to be misleading.

    • one year ago
  16. Shane_B Group Title
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    That's what I was trying to say :)

    • one year ago
  17. erin512 Group Title
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    thanks so much, the graph was much easier to see it. i understand it much better now :)

    • one year ago
  18. Shane_B Group Title
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    At any rate erin, the lines are the problem

    • one year ago
  19. Shane_B Group Title
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    no problem!

    • one year ago
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