around campus. Find a 95% confidence interval to estimate the population proportion of all students at this school

who support the bike trails. Include your calculations for margin of error.

A professor wants to conduct a study regarding student prerequisite knowledge for College Algebra. She studies the

placement test scores and is told that the population standard deviation is 6.72. How many students would she need for

her study if she wants to build a 95% confidence interval with a margin of error of 2 points?

We want to estimate the number of people in our community who believe that traffic has gotten worse.

a.

How many people would you need to survey in order to have a 95% confidence interval with a margin of

error of 0.08?

b.

If a previous study in a neighboring community found that 265 out of 802 found that traffic was worse,

how many people would you need for your survey in order to have a 95% confidence interval with a

margin of error of 0.08