Correlation and Regression Analysis(Lecture 7: Statistics and Informatics for Disaster Managers)Mohammad Samsul AlamAssistant Professor of Applied StatisticsInstitute of Statistical Research and Training (ISRT)University of DhakaM. S. Alam(ISRT, DU)Lecture: 7[email protected]1 / 23
MotivationFollowing 100 data obtained from 100 fire incidents inDhaka city by recording how long (in minutes) theysustained:1992901791721551282111368227184175126816519922323314570851652302117240976148852470112651141452231261622331331382162417244322017523310215145138852417520168128991841218219618721317225802252919133221848228218158162392137315822810184611481820102124958712420651M. S. Alam(ISRT, DU)Lecture: 7[email protected]2 / 23
Cont... IRecall thatMedianis a number that divides thedata, arranged in either ascending or descendingorder, into two (02) equal parts. This implies thatvalues in one part are smaller than the median andvalues in the other part are greater than the me-dian.Like medianQuartilesare three (03) numbers bythem we divide a given set of data, arranged ineither ascending or descending order, into four (04)equal parts.M. S. Alam(ISRT, DU)Lecture: 7[email protected]4 / 23
Cont... IIOf them the smallest one is calledfirst quartile,whereas the middle one is calledsecond quartile,and the greatest one is calledthird quartile.First quartileis a number which greater than 25%values of the given set of data and smaller than75% values of the given set of data.Second quartileis a number which greater than50% values of the given set of data and smallerthan 50% values of the given set of data. That iswhy it is also calledmedian.