Thread: Z Scores

This is my first time to this forum.....I wish I had found it earlier in my Stats class.

My question is:
Where would I go to find the z-score that corresponds to different percentile?
For example the 35th or the 72nd or what not.

I know that the mean is o and 1 standard deviation to either side is about 34%.

Please help!!!



The z-score that corresponds to the 72nd percentile?

Locate 0.72 in the Standard Normal table and find the corresponding z-score.

Apears to be about z=0.583

Originally Posted by stat student

This is my first time to this forum.....I wish I had found it earlier in my Stats class.

My question is:
Where would I go to find the z-score that corresponds to different percentile?
For example the 35th or the 72nd or what not.

I know that the mean is o and 1 standard deviation to either side is about 34%.

Please help!!!



The z-score that corresponds to the 72nd percentile?

You need a table of the cumulative standard normal distribution. This is a
table that gives the p-value for a given z-score. To find a z-score
corresponding to a given p-value you use the table in reverse.

A table can be found at the bottom of this page.

RonL

What is the p in this case? So you told me that 72% is 0.583....could you explain to me step by step how to find say the 35%

thanks again to both of you

Originally Posted by stat student

What is the p in this case? So you told me that 72% is 0.583....could you explain to me step by step how to find say the 35%

thanks again to both of you

Well, I think p is percentile. But that's about all I know. I'm also having a ton of trouble understanding z tables!

I found .583 if I follow the column up I find .001 and all the way to the left I find .2..........I am really confused...I just don't get it....how do I read the table?