In order to conduct a study of resistivity on a certain semiconductor wafers, a

Question

In order to conduct a study of resistivity on a certain semiconductor wafers, a sample was taken from a supply of semiconductors kept at a storage facility, The items kept at the is a storage facility considered to be the: Conceptual population physical population virtual Population manufactured population which of the followings is an appropriate measure of the variability of a sample Mean median Standard Deviation sample size As a quality assurance attempt in a manufacturing setting, every fifth item is picked for further testing till a sample of 50 is attained. This type of sampling is called: Convenience Random systematic stratified At of 3000 thermometers manufactured by a thermometer manufacturing firm in one week 400 are reading the freezing point between "0" degrees and ".-5" degrees. Out of the 400 thermometers 150 of read the freezing points below "-5" considered to degrees. 150 is considered Parameter Statistic Variable population

Explanation / Answer

17)

Answer is conceptual population as the resistivity is a non physical thing.

Conceptual Populations: Populations whose members exist
only in our imaginations; e.g. breaking strength of pencils all
of a certain type that you could possibly use this semester.

18)

Answer is standard deviaiton as it gives us a idea of how much a data is varying.

Standard deviation is a quantity expressing by how much the members of a group differ from the mean value for the group

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