Mathematics, 27.05.2020 19:00 jojonono

Let x be a random variable that represents assembly times for the Ford Taurus. The Wall Street Journal reported that the average assembly time is hours. A modification to the assembly procedure has been made. Experience with this new method indicates that the population standard deviation of the assembly time is 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 of the new method to be hours. Does this indicate that the average assembly time has been reduced

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Let x be a random variable that represents assembly times for the Ford Taurus. The Wall Street Journ...