Question

1. (a) Explain what is meant by a census. (b) Write down two disadvantages of using a census rather than a sample. Each circuit board produced at GC Electronics is given a unique serial number. GC Electronics produces circuit boards in batches of 5000. Before selling each batch, the company tests a random sample of 20 circuit boards from the batch to check that they will fit into a standard computer slot. (c) Suggest a suitable sampling frame from which to obtain this sample. (d) Identify the sampling units (Total 4 marks)

Answer 1

Census A census is an official survey of the population of a country that is carried out in order to find out how many people live there and to obtain details of such things as people�s ages and jobs 2 Disadvantages of census rather than sample Limits other possible opportunities (2) Decline response rate (3) census surveys tend to be longer than the \r\n typical survey. Sample advantage: quicker, cheaper eater. (3) stratified sampling is the best choice because the samples are selected from each bath randomly in the groups said to be stratified sampling (4) A sampling frame is a potential source of samply units ex: \r\n A sampling unit is an individual member of a population or from a group the each batch from a GC electronics