Let x be a random variable that represents assembly time for the Ford Taurus. The Wall Street Journal reported that the average assembly time is µ = 38 hours. A modification to the assembly procedure has been made. Experience with this new method indicates that σ = 1.2 hours. It is thought that the average assembly time may be reduced by this modification. A random sample of 47 new Ford Taurus automobiles coming off the assembly line showed the average assembly time using the new method to be xb = 37.5 hours. Does this indicate that the average assembly time has been reduced. Use a = 0.01. What is the P value (round to ten thousandths)? Should we accept the null hypothesis? What is the level of significance?