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Roadblock State police set up a roadblock to estimate the percentage of cars with up-to-date registration, insurance, and safety inspection stickers. It would be too inconvenicnt and costly to check every vehicle that passes through a checkpoint, so they decide to stop about 1/20 of the vehicles. a) Why would a simple random sample be unreasonable for this situation. b) Identify two possible sampling schemes that could be used. Explain how randomization would be used in each.

Respuesta :

(a) All cars in the U.S. (b) Proportion of cars with up-to-date registration, insurance and safety inspection stickers

(A) The population consists of all the people or things we want to gather data on.

All American autos comprise the population (b) A statistic is a descriptive measure for a sample, whereas a parameter is one for a population.

The percentage of vehicles with current registration, insurance, and safety inspection stickers is the PARAMETER.

(c) The list of people from whom the sample is taken is known as the sampling frame.

SAMPLING FRAME = All vehicles that pass the location of the roadblock.

(d) The portion of the population from whose data was actually gathered is known as a sample.

SAMPLE = Every vehicle that clears the erected roadblock.

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