Transcription of Chapter 2: Frequency Distributions and Graphs Read ...
1 Chapter 2: Frequency Distributions and GraphsRead:Sections 1, 2, and 3 pp 32-54 Work the following text examples:Section 2-1, 2-2, 2-3 Section 2-4, 2-5, 2-6, 2-7 Examples to be worked in Exercises 8 and Exercises 24 and 34 Homework:Exercises 1-6, 7-17 odd, 19-37 oddCritical Thinking:See problem 4 p. Organizing Data Categorical Frequency distribution Step 1:ClassTallyFrequencyPercentFrSoJrSe Step 2: Step 3: Step 4: Find the percentage of values in each class by using the formula% =fn,wheref - Frequency in the classn - total number in the class. Grouped Frequency distribution Class LimitsClass BoundariesTallyFrequencyCumul. 1: Determine the classes. The class width is given byWidth =rangenumber of classes= Lower Class Limits- Upper Class Limits- Class Boundaries- !
2 !! !!! Step 2: Tally the raw 3: Calculate 4: Find cumulative for Constructing Grouped Frequency Frequency distribution Class LimitsClass BoundariesTallyFrequencyCumul. 1: Determine the classes. Steps 2-4: Tally, calculate frequencies, calculate cumulative frequencies, - Why did we do this? Histograms, Frequency Polygons, and Ogives Histograms, Frequency Polygons, and Ogives for Frequency TablesHistograms -6 Step 1:Step 2:Step 3: Frequency Polygons Class BoundariesMid-pointFrequencyCumul. - - - - - - - - 1:Step 2:Step 3:Step 4:Note:Ogives -6 Step 1:Step 2:Step 3:Step 4:What have we visually represented with an ogive? We have developed a picture of how manyvalues are below a certain class Frequency Graphs Class BoundariesMid-pointRel.
3 Rel. - - - - - - - - using Relative Frequency -6 Frequency Polygon using Relative Frequencies-6 Ogive using Cumulative Relative Frequencies-6
