Example 3: If X1, X2,...,Xn are a random sample of size n from a
population with p. d.f. given by:
f(x)=, e
e-x-0), 0<x<00
TO elsewhere
Show that X – 1 is an unbiased estimator of parameter e.

The american academy of pediatrics wants to conduct a survey of recently graduated family practitioners to assess why they did not choose pediatrics for their specialization. provide a definition of the population, suggest a sampling frame, and indicate the appropriate sampling unit.