(1a) A recent survey by the alumni of a major university indicatedthat the avera

Question

(1a) A recent survey by the alumni of a major university indicatedthat the average salary of 8000 of its 250,000 graduates was$120,000. Does the numerical value "$120,000" describe a populationparameter or a sample statistic? Explain yourreasoning.  

(b) State police set up a roadblock to check cars for up-to-dateregistration, insurance, and safety inspections. They usually findproblems with about 10% of the cars they stop. Identify thepopulation and the sample. Is there any potential for bias ingeneralizing results? If yes, what kind?   

(1c) Which is used more often, a sample or a population? Why?

   
(d) What method of data collection would use computersoftware to imitate chance behavior? Circle one of the following asthe correct answer: use a simulation, use sampling, performan experiment, or take a census.

Explanation / Answer

a) sample size is 8000 population size is 250000 sample mean is $120,000 Therefore $120,000 is a sample statistic. b) Here population is total cars and sample is cars they stop.(the remaining part is not clear) c) sample is used more often. We cannot always study thepoulation. We may not have the entire data. It is time taking andinvesting cost. So, we prefer sample more oftenly. d) simulation. All the other methods can be doneby hand and some of them are not to study chance behavior.

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