kinyutaka t1_ixqqqu6 wrote on November 25, 2022 at 4:05 PM

Theoretically, in any group of people, the majority of the body will be average in knowledge and intelligence, and few will be outlying to the top or bottom. This creates a "bell curve", a hump in the graphical representation of the class.

If everything is done right, then the majority of students will receive a similar grade, hopefully around 70 (passing) anyway.

But if the concepts are harder, the whole class might get dragged back, putting the average grade lower, let's say 68, failing if you just grade the tests.

Grading on the curve corrects for the fact that they are doing the best they can, pushing the passing score down to 67. It allows for a teacher to fudge the numbers and allow for fewer failures for little mistakes.

But if you have a student that greatly excels in the test, that throws off the Curve. Among other things, it suggests that the subject matter wasn't all that hard and the "barely failing" students simply failed to learn the lesson.

GESNodoon t1_ixqt7ml wrote on November 25, 2022 at 4:24 PM

Grading on the curve addresses the outliers generally. If the average grade is 68 but someone scored 100 (or a 0), you can ignore the 100 score as an outlier. You could have someone who is just really knowledgeable on the subject matter or someone who is cheating, which grading on the curve can be useful for finding.

kinyutaka t1_ixqwmho wrote on November 25, 2022 at 4:49 PM

That all depends on the teacher. Grading on the curve doesn't really employ any complex math. It is just suggesting that they push the pass/fail line up or down based on what the teacher thinks it should be set at.

GESNodoon t1_ixqx2s0 wrote on November 25, 2022 at 4:53 PM

Most that I have had that grade on a curve are setting x% as an "A", "B", C" and so on. Oddly this is how my employer does raises. A certain percentage of each department is going to get an "Exceeds" a certain percentage is going to get an "Improvement Needed" each evaluation cycle.

mysteriouslime OP t1_ixqvljq wrote on November 25, 2022 at 4:42 PM

ahhh the bellcurve makes sense! i think i was imagining it as just a regular upswing curve, but that clears it up for me a lot - thank you!