Question

A researcher wants to determine the proportion of vehicles in the Denver area that are driven with cracked windshields. The research team goes to the ten Denver International Airport (DIA) parking lots (Valet West, Valet East, Short Term West, Short Term East, Garage West, Garage East, Economy Lot West, Economy Lot East, Pikes Peak Shuttle Lot, Mt. Elbert Shuttle Lot) to record information. The parking lots do not have the same number of total spaces. Five random rows are selected at each parking lot. The number of vehicles in the row and the number with a crack in the windshield are recorded.

What is the population being studied?
What is the sampling technique?
Discuss advantages and disadvantages of this plan.
Explain each question in one to two sentences.

Answer 1

ANSWER:

* The population being studied here is the proportion of vehicles in the Denver area that are driven with cracked windshields.

* The sampling technique used is stratified sampling.

* The advantages of stratified sampling are-

1. A stratified sample can provide a greater precision.

2. A stratified sample requires a smaller sample which is financially helpful.

* The disadvantages of stratified sampling are-

1. A stratified sampling require more administrative effort.

2. The analysis of a stratified sampling is computationally more complex.

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