15 7 RULES OF GRAPHINGFollow these simple rules for GREAT GRAPHS
16 RULE # 1.1. Always draw neat lines with a straight edge or ruler
17 RULE # 2. Make your graph 1 full page in size. Small graphs are too difficult to read patterns or results of your experiment.
18 RULE # 3. Label the x-axis (goes across the bottom of your graph) Label the y-axis ( the line that goes up & down on the left side of your graph)
19 RULE # 4. Label three places on your graph. 1. TITLE the graph descriptivelyWHAT DOES YOUR GRAPH SHOW US?
20 RULE # 4. 2. label the x-axis with the independent variable this is the variable you pre-set before you began collecting data, on the left side of a “T” tablecommon independent variables can be time, or distancesData points should be evenly spaced
21 RULE # 4. 3. label the y-axis with the dependent variable this is the variable you measure when you begin collecting data, on the right side of a “T” tablecommon dependent variables can be mass, or temperatureData points should be evenly spaced
22 RULE # 5.Number the x and y axis with a regular numerical sequence or pattern starting with 0 to space out your data so it fills the entire graphexamples: 0, 5, 10,0, 2, 4, 6, . ., 0, 0.5, 1.0, 1.5, 2.0
23 RULE # 6.Number the x and y axis on the lines of the graph, not the spaces between the lines
24 RULE # 7.If your graph shows more than one trial of data, or has more than 1 line, USE A KEYA key can be different colored lines, lines with different textures or patterns.
25 Choose the best graph for the data Pie chart- shows percentages and parts of a wholeBar graph- best for comparing dataLine graph- best for looking at change over timeStem & Leaf plot- comparing data that can also show mean, mode, and median
26 Statistical AnalysisMean- (average)- add up all the data & divide that total by the number of data points ex. : 1,2,3,2,4,2 = 14 14/6= 7/3 or 2.3Mode- number seen most often ex:1,2,3,2,4,2 mode is 2Median- middle value when data is placed in numerical order Ex.: 1,2,2,2,3,4,5 oddex:1,2,2,2,3,4 even 2+2=4/2=2 median is 2Range- difference between the greatest # and the smallest # in the data set ex.1,2,2,2,3, = 3 data vary over 3 values
27 How to change numbers into % for pie charts. You can refer to your book on page 770.Determine the total number for your data: add up all the values to get one number. 1,2,2,2,3,4 = 14Divide each proportion by the total number. 1/14, 2/14. 3/14, 4/14Multiply that decimal by This will give the number of degrees that your pie piece should contain. Ex. 2/14= x 360= 51.4 degreesUse a protractor to measure the angle of each slice.To find the percentage take the number of degrees in the slice divide it by 360 and multiply the new number by 100% / 360= x 100% = 14.3 %
28 Good Luck and Happy Data Collecting! The EndGood Luck and Happy Data Collecting!