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

Question

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 nano-fibers. 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.

Explanation / Answer

a.) Statistical Population - Super strength threads made of nano fibres.

   Sample - 20 specimens of these super strength threads

   Variable of interest - Tensile strength (of the super strength threads)

b.) Statistical Population - Hundreds calls recieved on a day

     Sample - 15 calls out of hundred

Variable of interest - Number of calls that ended without a satisfactory resolution of the problem.

c.) Statistical Population - Thousands flash memory card manufactured on a day.

   Sample - 30 cards selected from those manufactured on a day.

   Variable of interest - number of cards that do not meet manufacturing specification.

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