AP STATISTICS HW HELP

To get started on #5 you need to combine the results from the B sections so that you end up with two proportions A and B. Combining the B successes and attempts gives you 104/179. Now calculate the proportion of successes for both A and B.

A = 167/279 = 0.5986 with a 95% binomial confidence interval of 0.5385-0.6566

B= 104/179 = 0.5810 with a 95% binomial confidence interval of 0.5051-0.6542

Depending on how your teacher has directed you to do hypothesis testing of binomial proportions you can look at the CIs to see if they're overlapping, or you can perform an analysis of two proportions based on the formulas you've been given. Confidence intervals that do not overlap are significantly different at a given alpha level. Be careful, though, intervals that overlap can still be significantly different. Do you have a formula for comparing two proportions?

well we dont really have formulas, we use functions of the ti-84 calculators like 2-sample intervals or 2-sample z-tests etc. etc.
also i have no idea if i did #1 right or not and have no way of checking. would you mind doing that out yourself and seeing what you come up with too?

thanksSOmuch

Sample size calculations can be pretty complicated. If you google "sample size margin of error TI84" then you'll see a word doc that you can download that will run you through an example. I'm not at all familiar with the TI84. It was the second google hit titled "Activity Overview"