Mathematics, 25.06.2021 03:50 live4dramaoy0yf9
The Arizona Department of Transportation wishes to survey state residents to determine what proportion of the population would like to increase statewide highway speed to 75 from 65 mph. At least how many residents do they need to survey if they want to be at least 99% confident that the sample proportion is within 0.02 of the true proportion?
Answers: 1
, and a confidence level of 
, we have the following confidence interval of proportions.
.
, z is the value of Z that has a p-value of 
, so 
. 
. As we have no estimate for the proportion, we use 
. So
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