A safety expert appointed by the government is tasked to investigate the safety

Question

A safety expert appointed by the government is tasked to investigate the safety of automobile tires in operation in the year 2009. Results of this study are expected by the end of 2011. Among other things, the expert is interested in estimating the proportion of automobiles in the country having tires with unsafe tread. In addition, estimates are required separately for each of the ten regions in the country. a. What is the target population for this study? b. What are the sampling units?. c. Propose a sampling frame for this study. d. What may be some potential imperfections to your proposed frame in (c)? e. Propose a method of data collection for this study Justify your answer f. State any three sources of non-sampling errors that may be encountered in this study and explain how each of these may be reduced. g. For this study, why do you think a sample survey may be preferred to carrying a complete census survey.

Explanation / Answer

a. Target population is the automobiles for this study

b. sampling units are the automobiles

c. A stratified random sampling can be done where regions can be put into strata so that we cna make sure that we are not missing out on any region's

d. Sampling error may happen if sample size is not good enough,

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