A researcher studies the effect of the herbal stimulantButtercup on short-term memory; she randomly divides a sample of 32into four (4) groups.  Each group receives 0 mg, 500 mg,1000 mg and 1500 mg respectively and is then tested on their shortterm memory span.  She finds:
                        NUMBEROF ITEMS REMEMBERED (MEMORY SPAN)
            0.0mg             500mg                        1000mg                      1500mg         Â
            8                      7                                  10                                4
            9                      6                                  15                                5
            7                      9                                  14                                2
            7                      8                                  14                                4
            8                      8                                  17                                3
            10                    6                                  13                                8
            6                      12                                9                                  7
            7                      9                                  12                                9
A.        State theIndependent Variable and the Dependent Variable.
B.        State the nullhypothesis in words and symbols.
C.        Compute theappropriate statistic.
D.        What is yourdecision?
E.         Statethe full conclusion in words, after computing,if necessary multiple comparisons.
