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You are undertaking a household travel survey for a large urban area. One of your key...

You are undertaking a household travel survey for a large urban area. One of your key variables is the proportion of people who use bicycle for their travel, and the other key variable is the proportion of people who drive their own car. You estimate that the proportion of bicycle trips in the urban area is 0.5 percent and that the proportion of car driver trips is 55 percent. If the same accuracy is desired for each of these, of a maximum sampling error of 0.002, what sample sizes would be required for each of these two key variables?
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Answer #1

FOR BICYCLE TRIPS

the sampling error for proportion is

the proportion of bicycle trips is p = 0.005

FOR CAR DRIVE TRIPS

the proportion of car drive trips is p = 0.55

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