Sony Corporation conducted a survey to determine customer satisfaction levels with their television sets. Interestingly, after matching the survey satisfaction data with production records, Sony discovered the customers who purchased televisions manufactured in Plant 1 were more satisfied than customers whose sets were produced in Plant 2. Upon further investigation, Sony discovered the following distributions for a critical component in the television picture tube:

a. Which plant has more process variation?

b. Plant 2 did not ship any "defective" products because each television set was inspected. Plant 1 shipped a small number of "defective" products because products were not inspected. Why were customers whose sets were manufactured in Plant 1 generally happier with their purchases?

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Plant 1 Normal Distribution Plant 2 Uniform Distribution -4.00 -3.00 -2.00 -1.00 0.00 1.00 2.00 3.00 4.00 Defective Meet Specifications Defective