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SashulF [63]
3 years ago
14

A study done by researchers at a university concluded that 70 70​% of all student athletes in this country have been subjected t

o some form of hazing. The study is based on responses from 1 comma 900 1,900 athletes. What are the margin of error and​ 95% confidence interval for the​ study? The margin of error is nothing .
Mathematics
1 answer:
Alecsey [184]3 years ago
6 0

Answer:

The margin of error is 0.0206 = 2.06 percentage points.

The 95% confidence interval for the proportion of all student athletes in this country have been subjected to some form of hazing is (0.6794, 0.7206).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the zscore that has a pvalue of 1 - \frac{\alpha}{2}.

For this problem, we have that:

n = 1900, \pi = 0.7

95% confidence level

So \alpha = 0.05, z is the value of Z that has a pvalue of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

The margin of error is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

M = 1.96\sqrt{\frac{0.7*0.3}{1900}} = 0.0206

The margin of error is 0.0206 = 2.06 percentage points.

The lower limit of this interval is:

\pi - M = 0.7 - 0.0206 = 0.6794

The upper limit of this interval is:

\pi + M = 0.7 + 0.0206 = 0.7206

The 95% confidence interval for the proportion of all student athletes in this country have been subjected to some form of hazing is (0.6794, 0.7206).

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