Quiz 9: Determining Sample Size and the Sample Plan
Sample frame is comprised of the master list of members or things included in a defined population. Sample frame is updated for each new entry in population. Sample frame error comprises the difference between sample frame list and the actual existence of a particular population. It shows the misrepresentation of population in the sample frame list. Errors found in the household listing of a telephone book are listed below: • Missing numbers. • Typing errors. • Absence of new numbers obtained after publishing the directory. • Disconnected telephone numbers. • Telephone device failure. • Numbers which have unpaid bills. These errors show the misrepresentation of household listing present in a telephone book.
Sample frame error comprises the difference between sample frame list and the actual existence of a particular population. It shows the misrepresentation of population in the sample frame list. Reasons that lead towards the failure of election survey conducted by Magazine LD are listed below: • Even though the survey was conducted on a large sample, it provided an incorrect result; because selection of respondents was improper for the survey. • Sampling frame list utilized by the researchers didn't contained potential voters from both parties. • The survey was conducted at the time of great depression. It had the following impacts on survey results: o People who used telephone, automobile, and magazine subscriptions were mostly republic than democratic. o These people faced lesser impact of depression as they were republic. Therefore, they voted for the wrong person. o Most of the remaining persons were democratic. They voted for the other candidate considering the depression in economy. Due to the above reasons, prediction made by Magazine LD went wrong.
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