?a) Police set up an auto checkpoint at which drivers are stopped and their cars
ID: 3253570 • Letter: #
Question
?a) Police set up an auto checkpoint at which drivers are stopped and their cars inspected for safety problems. They find that 23of the 116cars stopped have at least one safety violation. They want to estimate the percentage of all cars that may be unsafe.Identify the population. Choose the correct answer below.
A.
Those cars actually stopped at the checkpoint
B.
The passengers of those cars actually stopped at the checkpoint
C.
All cars
D.
All car passengers
Identify the sample. Choose the correct answer below.
A.
All car passengers
B.
Those cars actually stopped at the checkpoint
C.
The passengers of those cars actually stopped at the checkpoint
D.
All cars
What does p? represent?
A.
The proportion of all cars with safety problems
B.
The proportion of cars actually seen with safety problems
C.
The sample size
D.
The standard deviation of the proportion of cars actually seen with safety problems
A.
The sample size
B.
The standard deviation of the proportion of cars actually seen with safety problems
C.
The proportion of all cars with safety problems
D.
The proportion of cars actually seen with safety problems
Is it appropriate to create a? one-proportion confidence interval? (i.e. also called a? z-interval)?
A.
It is not appropriate because the sample is a simple random sample.
B.
It is not appropriate because the sample is less than? 10% of the population.
C.
one dash proportion z dash interval.
D.
It is appropriate because the sample is less than? 10% of the population.
pExplanation / Answer
1) the population is, C) all cars.
Our population is all cars in the country or that particular area for which they want to estimate the percentage of unsafe cars.
2) oue sample is, B)those cars actually spotted at the check point.
3)p represents, A) the proportion of all cars with saftey problem.
4) D) the proportion of cars actually seen with saftey problem.
5) B) it is not appropriate because the sample is less than 10% of the population.
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