Project Math Access DVD 03 - Graphing - Part 03
Transcript Start

Audio Description: Part three; student interview; use of graphs produced with thermal copier.

JOHN: This is another example of a graph, although this time it's done on the PIAF machine. Again, this is still a relatively easy graph to read. I can tell going across the bottom it's the percentage of sugar concentration, and across the top it's the apple core change in mass. 

I can still tell the correlation as the percentage of sugar goes up, in the water solution the apple core was placed, the mass of the apple core goes down. I can still tell where it levels off, which at this point it looks to level off more around,... maybe... ohhh... somewhere between... 1.5 and 2. And this happens just after the sugar concentration hits maybe ... maybe, about... 1. After 1 I can tell it kind of levels off. 

There is a slight disadvantage here, however. In the other graph we had 3 lines that showed up One was a hot glue line, one was a puffy paint line, one was a pipe cleaner line, and one was the Wikki Stix line. None of these over here showed up because they weren't really relevant to the graph. On the PIAF machine, they do however. And sometimes they do make this line a little hard to read. For example I might say that in following along the bottom, and then I come to this line right here I might pass it straight up, because the line intersects exactly with the PIAF line. 

So, sometimes it does get a little bit difficult to read because of those other lines there. But, for the most part I'm still abIe... after taking a look at it for a second time to identify that there are in fact 2 lines there. 

For example, at this point right here, which is, oh, about point 6 on the graph, I can tell that the sugar concentration... I'm sorry, change in mass is about point 5. And one advantage to this, however, is that because these other lines have printed out you can say, okay, I know I was in between this and this line when I found... I was right in between here, when I found this point right here. And then I can just follow, use these two lines as a guide, and follow them to the left side and make a more accurate reading. I know this is, right now, between zero and point 5, for example. This point right here, which I found in between these two lines, is between zero and point 5. And I do this by using these two lines as a guide for my finger.