Explain the method of retrospective study for collecting data. Consider the semiconductor wafer data in Table 4. Suppose those 10 wafers are selected randomly (without replacement) for an electrical test. Determine the probability that exactly 4 wafers have high contamination. Table 4: Wafers in Semiconductor Manufacturing Classified by Contamination and Location Location in Sputtering Tool Contamination Centre Edge Low 514 68 High 112 246 Total 626 314 Total 582 358

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