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hi everyone let's begin will coxen sign t test or will coxswain sign rank test this is the test when we want to check paired data we have earlier when our data is normally distributed then we are going to apply uh prt test but when our data is not normally distributed we are going to apply wilcoxon scienti test we want to check some pre and post analysis or i mean we want to compare some same kind of because these are not two independent samples these are the one independent sample and test and retest i'm in pre and post we want to check then we are going to apply wilcoxon sign t test so let me share one of the case study uh through which i would like to explain you wilcoxon signed rank test it will concern sign rank test sometimes called wilcoxon t-test is used when repeated measures are used in case of prt test and when same participants perform under each level of independent variable we use wilcoxon sign rank test so here is i have got the data assurance manager compares the laptop sales for the year in two parts he wants to compare the sales of first half and second half of the year he recorded the sales from 20 showrooms and saved their sales in rupees lex so here is you can see serial number i had mentioned total 20 sample size and sale 1 means uh that is the first half year sales 10 to june and sale 2 july to december sale so here is we want to just check we want to compare whether there is any significant difference between these two this is the bi-annual data so this is the any significant difference so let me i had created this hypothesis the distribution of sales and rupees lags is the same across categories of the retail stores so we have to check this data uh through our studio through our so let me clear all these things i would start at fresh i am clearing all my windows yes and i am closing this file also and now you can see this is the r script and now what we have to do uh let me open let me import my file my file is i am going i want to import my spss file let me browse it and this is my spss file and let me open this file and i am going to open this file and i'm i want to import this file let me press import and now you can see here here there is two columns sales jen to june and sales july to december so now you can see how many entries are here total number of entries are 20 and that is reflecting also here wilcoxon sign test and 20 observations of two variables so i am carrying only two variables but there is 20 observations are here so...