In a random sample of 112 State College students, 41 students reported being current smokers.

Question

a) Calculate the 95% confidence interval for the proportion of State College students who smoke.

Answer 1

Use a confidence interval formula for proportions. Here is one:
CI95 = p ± (1.96)(√pq/n)
...where p = x/n, q = 1 - p, and n = sample size.

Hint: x = 41, n = 112
(Convert all fractions to decimals.)

I hope this will help get you started.