Refer to Exercise 7.24. How would your inference procedures change if preparation A was an old product

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Refer to Exercise 7.24.
Refer to Exercise 7.24. 
How would your inference procedures change

How would your inference procedures change if preparation A was an old product that had been on the market a number of years and preparation B was a new product, and we wanted to determine whether people would continue to use B a longer time in comparison to preparation A?

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