Leah's Toys guarantees to ship customer orders in 24 hours or less. The following chart contains results for five samples of nine customer orders each:
a. Based on these results, estimate the p and Sp values.
b. A student comments, "Time is a continuous variable. We should really be looking at the X and R values." Do you agree or disagree? Explain your rationale.

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SAMPLE CUSTOMER ORDERS SAMPLE (HOURS TO SHIP) 1 3 5 21 4 15 9 7 3 6 2 22 16 8 16 11 38 11 25 15 2 19 4 2 4 9 16 18 7 10 1 11 10 20 18 1 6 3 18 9 3 2 5 17 4 6. 7 18 9 16