Question

Let x be a random variable that represents assembly times of a Lexus R350. The company reported the average assembly time is µ=38 hours, with a standard deviation (sigma) of 1.2 hours. An engineer developed a modification in the process that is believed to reduce the assembly time. When a Radom sample of 47 vehicles being completed, the sample mean (x-bar)=37.5 Use α = 0.01 and find the P-Value