The mean and standard deviation of the times that it took for the ‘Action’ breakdown recovery service to assist a random sample of 47 motorists were 51 minutes and 7 minutes. The mean and standard deviations of the response times recorded by the rival

‘Bistry’ service in assisting a random sample of 39 motorists were 49 minutes and 5 minutes. Test the hypothesis that there is no difference between the mean response times of the two breakdown services. Use a 5 per cent level of significance.