2. Now you are planning to replace the old X-Ray machine described in Question 1 with a new X-Ray machine. The average natural process (admission) time of the new machine is also 5 minutes with a standard deviation of 3 minutes. However, the new machine requires setups. The average setup time is 40 minutes with a standard deviation of 10 minutes. Assume that the new machine can screen 100 trauma patients between setups.

1. Identify the following parameters:

ts: ______________ s: ______________ cs: ______________

2. What will be the effective mean and coefficient of variation of the admission time for a group of 50 trauma patients? (Hint: Ns is 2 since the new machine can screen two groups of size 50. Also, use your answers for Question 1-Part b to identify the value of t0 and 0.)

te: ______________ e²: ______________ ce: ______________

3. In two sentences, describe how the manager of center can improve the inflated effective admission time in Part b?

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4. Based on your calculation, what will be your decision? Replacing the old X-RAY machine with the new one or keeping the old machine? Why? (Hint: Assume that the center has no budget constraint.)

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