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Automotive Science and Mathematics P2

Descriptive statistics – pictographs Pie charts and bar charts are examples of pictographs. Pie charts Pie charts can be used to highlight certain features of data contained in a report. For example, a report by the Office of Fair Trading on garage repair and servicing that was published in the year 2000 contained information which included that there were 16 000 independent garages, 6500 franchised ones, and 3800 Immediate Fit centres in the United Kingdom. This information can be made to have . | 18 Automotive science and mathematics braking systems were fitted to large vehicles. The question was raised Arethenumber of failures being reported unusually high and if they are whatmaybe Are causes A largesur-vey was condueaedanctaeresults wereenaF ysed to se-ewlaatpaSSeres exsstedia hie dats the resu ts werepcesented ina repotiaMt used both de-csipcva aaa un sAieas itaSirSics. Oca result wwa Shat hshucceitet wear Mgher titan experts ix eaed andon furatonxammeSme number oa eonSaibiiSery feaSorsto anapparer i high failureratcwerefoundie pky a part. a greater impact by displaying it in the form of a pie chart as shown in Figure 2.2. Constructing pieeograpfa wnp 2iX The pdahart I e exairnleoftheramposkionof the garage industry in Britain the total number of garages is 16000 6500 a800 26aOO.Teoemboportions hat eachaeetoraepeesente are traeuiinofihe loltd sne Independents Franchised Immediate Fit 16000 20300 0.6S 6500 26 300 0.25 3 800 26 300 0.14 2.4 Descriptive statistics - pictographs Pie chartsand bar chartsareexamplesof pictographs. s Pie charts Pie charts can be used to highlight certain features of data containeOPp a report. For example a report by the Office of Fair Trading on garage repair and serviainal.har. was pu sh 0 iie .a ee a e dia containetl in emtadoriwhich h i ua at ate eni were IfiOOOusdepeiiderii.gad es. e500 fraacMred ones and38as -mmealete ditaenitehxsSha Uxhed KingdoimTMainformaeiencanbe matte iohave Each sectoaoccupaes an equivalent proportion of the 360 ofihe nircSe that forms thebpsrr of the pie chart. In this case each garage sector occupies the followiae angle. tatueneorasSdeghgei Independents Franchised Immediate Fit 0.61 x060 220 0.25x 360 20 0.14x 360 50 From this whhnheaid o f compass esand a protractor the piesliartcan be corist.ruet.sol. Example2.4 In Figure 23 whicls showe woslelwide elieael hs number ofengines produced. The width of each Fig. 2.3 Bar chart showing worid ide distribute nof diesel engine production in 1987 Example .