The mean of the amount of time required to complete a critical partof a production process on an assembly line is believed to be 130 seconds. To test this belief, a sample of 100 randomly selected assemblies is drawn and the processing time recorded. The sample mean is 126.8 seconds. If the process time is normally distributed with a standard deviation of 15 seconds, can we conclude that the average assembly time is, in fact, 130 seconds?