AP Statistics Unit 6 Summary Part 3 Z-test for Difference Between Two Population Proportions

This video summarizes Unit 6 of AP Statistics, specifically conducting a z-test for the difference between two population proportions.

[ElliHacker]

Hi Mr. Porinchak! I am currently studying for my AP exam and watched all of your unit review videos (super out of order haha, that's why I'm commenting on this one!), and I just wanted to thank you so much for all the hard work and time you have spent making them! You help so many students like me each year with this super difficult class, and I am so grateful to have such a helpful resource!! I'm glad to finally be finishing with AP Stats and hope the exam goes well, so I just wanted thank you for the amazing videos that you put so much effort into making, they are a HUGE help!! :)

[williamdickson]

When calculating p-value, why do we use 1 as standard deviation (in normalcdf on calculator) instead of the standard error (0.0189 from the example) Is one always used as std dev when doing z tests ? I remeber using the standard deviation value calculated for other units and the one-sample test ? Apreciate the videos !!

[sola]

Hello Mr. Porinchak, when I calculated with normalcdf, i got an answer of 0.00545 as opposed to your 0.0041. I am wondering what I did wrong, thank you