Question: 78. Consider a sample x1, x2, . . . , xn and suppose that the values of , s2 , and s have been calculated.

78. Consider a sample x1, x2, . . . , xn and suppose that the values of , s2

, and s have been calculated.

a. Let yi  xi  for i  1, . . . , n. How do the values of s2 and s for the yis compare to the corresponding values for the xis? Explain.

b. Let zi  (xi  )/s for i  1, . . . , n. What are the values of the sample variance and sample standard deviation for the zis?

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