Surgical wounds heal more slowly in people who are stressed. Ten nursing students were given puncture wounds during their exam period and during summer vacation. Their rate of healing was much slower when they received wounds during their exam period. The following are the number of days it took the 10 nursing students to heal from their wounds during their exam period. 5 6 6 8 10 10 The mean of this population of numbers is u = 7.8, and the standard deviation is o = 1.66. Suppose you take a sample of four of these 10 nursing students. The following are the number of days it took the four students to heal from their wounds during their exam period. 9 10 9 10 The mean of this sample of numbers is M = , and the standard deviation is s = 0.58. Suppose you take sample of eight of the 10 nursing students. The following are the number of days it took the eight students to heal from their wounds during their exam period. 6 6 8 9 8 10 10

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