College smokers#
We are interested in estimating the proportion of students at a university who smoke. Out of a random sample of 269 students from this university, 34 students smoke.
Part 1: (a)#
Calculate the lower bound of a 95% confidence interval for the proportion of students at this university who smoke. (Reminder: Check conditions.)
Answer Section#
Please enter in a numeric value.
Part 1: (b)#
Calculate the upper bound of a 95% confidence interval for the proportion of students at this university who smoke.
Answer Section#
Please enter in a numeric value.
Part 1: (c)#
In one sentence interpret this interval in context.
Answer Section#
Please enter in a text response.
Part 2#
If we wanted the margin of error to be no larger than 3% at a 95% confidence level for the proportion of students who smoke, how big of a sample would we need?
Answer Section#
Please enter in a numeric value.
Attribution#
Problem is from the OpenIntro Statistics textbook, licensed under the CC-BY 4.0 license.