Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.



A2T scoring #34, 35, 37
Posted:
Jun 20, 2012 8:23 PM


We called on three questions and got some clear answers on scoring we had been struggling with.
 #34 (area of parallelogram)
Area of a triangle in radical form, clearly 1. Area of parallelogram as a decimal: clearly 1. What about area of a triangle as a decimal? SED says 0.
 #35 (trig graph with amplitude and frequency)
A twopoint question with 5 things they have to get right (sin, 3, negative, (2x) and y=). If they make two mistakes are they down to a zero?
SED's answer was: in order to earn 1 point, the student must get two out of three of the following correct: amplitude, freq and sin  if they have "y=." A mistake and no "y=" and it's a zero. See also the third "1" in the rubric.
So for example, y=3sin(something wrong) is 1 point; just 3sin(something wrong) is zero.
We weren't sure about y=3sin(something wrong), but I don't think it came up?
 #37 (within 1 sd of mean)
We tried to argue that since the original numbers have been rounded to whole minutes, it didn't make sense to report the sd with greater accuracy than that, so the student who rounded the sd to 15 should not be penalized. SED wasn't buying it.
But they did volunteer the following guidelines: * using the sample sd (15.4) instead of the population sd (14.9) is a concept error = 2 points * the student who writes sd=14.9 and then rounds to 15 used the correct sd and rounded inappropriately = 1 point * same for the student who writes (lower case sigma) = 15 * but for the student who wrote sd=15, or just went ahead and used an sd of 15, we don't know which sd they used, so 2 points

These are nice clear guidelines to follow and would help us be consistent statewide. Why the heck don't they say all this in the rubric???
(BTW, I was impressed that when they tried to call me back with an answer and found out they had an incorrect callback phone number for me, they didn't just give up: they looked on this listserv, found my email address, and sent me an email asking me to call them.)
(BTW #2, once yesterday and once today when I called, instead of the usual somewhat sullen phoneanswering person, I got the most cheerful and I'mheretohelpyouhowmayIdirectyourcall type of person. Quite a shock.)
Evan Romer Susquehanna Valley HS Conklin NY
******************************************************************* * To unsubscribe from this mailing list, email the message * "unsubscribe nyshsmath" to majordomo@mathforum.org * * Read prior posts and download attachments from the web archives at * http://mathforum.org/kb/forum.jspa?forumID=671 *******************************************************************



