Question

PLEASE HELP!

I have this question worth 20 points if you can answer it. Go to my questions and it's the one before this.
Which expression should you simplify to find the 90% confidence interval, given a sample of 90 people with a sample proportion of 0.25? O A. 0.25 +90 0.25(1-0.25) 1.645 OB. 0.25 + 1.645-0.25 90 O C. 0.25 +1.645 0.25(1-0.25) 90 O D. 0.25 +1.645. V0.25(1–0.25) 90 SUBMIT​

Answer 1

Option c:

`0.25 \pm 1.645\sqrt{(0.25*(1-0.25))/(90)}`

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{(\pi(1-\pi))/(n)}`

In which

z is the z-score that has a p-value of
`1 - (\alpha)/(2)`.

For this problem, we have that:

You have access to first year enrolment records and you decide to randomly sample 119 of those records. You find that 89 of those sampled went on to complete their degree. This means that
`n = 119, \pi = (89)/(119) = 0.7478`.

90% confidence level

So
`\alpha = 0.1`, z is the value of Z that has a p-value of
`1 - (0.1)/(2) = 0.95`, so
`Z = 1.645`.

Sample of 90 people with a sample proportion of 0.25

This means that
`n = 90, p = 0.25`.

Confidence interval:

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

`0.25 \pm 1.645\sqrt{(0.25*(1-0.25))/(90)}`

Which is option c.