The data are given in the following table: 
     FILTER         MEMB             CUP             BADGE

       26            45               36                21
       21            33               34                23
       16            26               33                27
       28            46               29                29
       27            25               30                24
       19            32               36                26
       21            33               28                27
       26            22               34                26
       25            30               34                24
       16            26               33                25
       20            37               33                31
       25            34               29                28
       25            44               28                30
       21            43               27                30
       23            35               27                31
       26            38               30                29
       21            38               29                29
       23            45               28                29
       17            39               31                30
       25            39               27                28
Question 2: Which type of data model does this experiment represent?
Answer: There are 4 columns, each column corresponding to one of 4 different "treatments". The objective is to compare the 4 treatments. This is k-sample data (of course, when it's in the section on k-sample data :-)