Identify the statistical population, sample, and variable of interest in each of the following situations:

(a) Tensile strength is measured on 20 specimens of super strength thread made of the same nanofibers. The intent is to learn about the strengths for all specimens that could conceivably be made by the same method.

(b) Fifteen calls to the computer help desk are selected from the hundreds received one day. Only 4 of these calls ended without a satisfactory resolution of the problem.

(c) Thirty flash memory cards are selected from the thousands manufactured one day. Tests reveal that 6 cards do not meet manufacturing specifications.