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.

The 95 percent confidence interval for the true proportion of all automobile accidents caused by alcohol is (0.2425, 0.3113).

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:

The 95 percent confidence interval for the true proportion of all automobile accidents caused by alcohol is (0.2425, 0.3113).

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step-by-step explanation:

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step-by-step explanation: