66, 78, 67, 61, 53, 66, 8, 47, 71, 93, 71, 78, 96, 69

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2. The disease-free survival (DFS) time of a treated cancer patient is defined as the length of elapse time between the time which the patient goes into remission (becomes free of cancer) and the time at which the patient relapses (cancer recurs). The following data show the DFS times, in months, of a random sample of 20 breast cancer patients.

9, 11, 2, 44, 21, 19, 19, 15, 7, 6

6, 45, 24, 12, 30, 12, 23, 3, 2, 13

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3. A pediatrician began testing cholesterol levels of young patients and was alarmed to find that a large number has levels over 200 milligrams per 100 milliliters. The readings for the 20 patients with high levels are given below:

210, 203, 213, 209, 208, 218, 212, 210, 212, 208

210, 218, 217, 199, 200, 207, 215, 214, 210, 221

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4. The following data of electrical resistances of insulation (unit: 100 megohms) was taken from Shewhart’s 1931 book, Economic Quality Control of Manufactured Products.

50.5, 42.9, 34.6, 47.2, 47.3, 46.2, 40.9, 38.5, 43.5, 39.8

52.0, 48.1, 46.4, 41.1, 57.5, 43.5, 39.3, 61.6, 45.7, 45.5

41.1, 47.4, 39.8, 36.5, 46.4, 44.1, 49.0, 41.8, 50.0, 42.9

37.6, 51.0, 40.7, 47.9, 47.9, 49.0, 44.3, 33.0, 54.9, 45.7

48.5, 47.5, 42.6, 44.9, 36.9, 46.5, 51.9, 47.0, 43.4, 41.7

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