In a randomly selected group of 650 automobile deaths, 180 were alcohol related. Construct a 95 percent confidence interval for the true proportion of all automobile accidents caused by alcohol.

a. [.243, .311]
b. [.262, .292]
c. [.259, .294]
d. [.263, .291]

a. [.243, .311]

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of , we have the following confidence interval of proportions.

In which

z is the zscore that has a pvalue of .

For this problem, we have that:

In a randomly selected group of 650 automobile deaths, 180 were alcohol related. This means that

95% confidence level

So , z is the value of Z that has a pvalue of , so .

The lower limit of this interval is:

The upper limit of this interval is:

So the correct answer is:

a. [.243, .311]

for the points! : )

27 +27 or 27times 2=54

the diffrence is 0