today we learned all the things we needed to remember during the year for when we make a graph. appearently we will be doing it a lot so THIS IS IMPORTANT!
5 BASIC THINGS WE NEED
- title- short and descrptive works best here. titles such as "time verses distance" or "speed of car verses time it takes" would be accepted as titles
- labeled axis- full names of the data being respresented... AND DONT FORGET THE UNITS!!!
- scale- we should be using about 70 percent of the space given for the graph, dont bunch it up in the corner. and dont use those squiggily things to make your graph longer, cuz its messes up your line. if your data starts at something higher than zero, just start there!
- correct data plot- make sure you are accurate and precise with your data plotting. even the smallest mistake can cause things to be off.
- line of best fit- use either a straight line of a SMOOTH curve. DONT JUST CONNECT THE DOTS!
linear graphs use the slope=rise/run to find the slope.
dont use the points you plotted for your slope calculation. instead, use the line of best fit. occasionally, there may have been an error in some of the gathered data, so the line of best fit will even it out so you can make a more accurate calculation
remember your line of best fit doesn't HAVE to start at zero.
there are different types of linear graphs
- direct relationship- the graph starts at zero and has a constant slope
- y=mx+b- this graph has a y-intercept, meaning it does not start at zero, making it a different type of linear graph
thats pretty much all thats new from today! problems? questions? queries? HAHA :P
here is an activty you can do to practice the placement of your line of best fit here (scroll down to the box that says "line of best fit")
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