<prompt> All of the following can be analyzed with chi square test except?Sex and stage of cancerHeart ratemin and AgeBenign or malignant, and type of surgeryAge group and cancer stage  <response>: b Heart ratemin and Age,Ref: Biostatistics Principles and Practice by B Antonisamy, Me graw hill publication, Pg-117In given question, all options except heart rateminute and age are of qualitative variables nominal or ordinal.Qualitative variables are usually presented in frequencies or count.Chi square test is used to compare any difference or association between two qualitative variables. Heart rateminute and age are quantitative variables where chi square test cannot be applied. Hence correct answer is b here. 