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Analysis of a Calculus Test – Part I

I gave a test a couple of weeks ago in my Calculus I class. The syllabus covered limits and derivatives. Among other problems, I always ask students to write down the derivative formulas and then give an assortment of derivative problems. Here is the relevant segment of the test:

TestProblems4-5

I noticed a correlation (0.72) between knowing the derivative formulas and finding the derivatives of more complicated functions correctly. Not that correlation implies causation or anything, just that there is one.

CorBetweenFormulasAndProblems

Without the outlier on the left, the correlation is 0.56, which is less, but still notable.

Would you say knowing formulas is predictive of solving derivative problems correctly on a test? Most calculus instructors would agree. It makes sense to commit to memory some of the routine formulas and rules, at least for the duration of the course, even if they are forgotten later. It becomes easier to participate in classroom discussions and speeds up doing the homework.

However, to answer the question more accurately I would have to give another class a test and allow them to have a  formula sheet. Then I could compare the test scores of the two classes to see if one class did significantly better than the other. And what if one class just happens to have stronger students than the other? Then I would have to repeat the experiment several times to draw a meaningful conclusion. Still, there may be completely unexpected lurking variables.

Nonetheless, here is a correlation and scatter plot for what it is worth. I like to see that group of points on the right end of the graph. It means there are a good number of students learning what I am expecting them to learn.

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  67. Pingback: Analysis of a Calculus Test – Part 2 | CUNYMath Blog

  68. Thanks for reading. That is a great observation. In fact, a student wrote on her test that she had difficulty figuring out when to use product rule versus chain rule. I will add a segment to my homeworks and tests to address this explicitly.

  69. In my experience what is most critical in students being able to be successful in doing problems like those in 5. is that they are comfortable with the pattern recognition skills (parsing the question if you like) so they can tell if they will need the product rule, the quotient rule, the chain rule in its “full glory,” just the power rule version of the chain rule (as is the case for 5b), or a mixture of these rules.

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