56. The times of rst sprinkler activation for a series of tests with re prevention sprinkler systems using an aqueous lm-forming foam were (in sec)

27 41 22 27 23 35 30 33 24 27 28 22 24

(see Use of AFFF in Sprinkler Systems, Fire Tech., 1976: 5). The system has been designed so that true average activation time is at most 25 sec under such conditions. Does the data strongly contradict the validity of this design speci cation? Test the relevant hypotheses at signi cance level .05 using the P-value approach.