Does anyone have a link to the chart that you use to find the probabilities of z-scores? Mine is not in my book.

A question like:

P(-2.02<z<0.58)

How do you go about handling that?

Printable View

- Nov 20th 2006, 11:13 AMGoneFishingProbabilities of z-scores
Does anyone have a link to the chart that you use to find the probabilities of z-scores? Mine is not in my book.

A question like:

P(-2.02<z<0.58)

How do you go about handling that? - Nov 20th 2006, 11:38 AMThePerfectHacker
Firstly the chart does not work for all values.

You need to simplify that.

$\displaystyle P(-2.02<z<.58)=P(-2.02<z<0)+P(0<z<.58)$

Now,

$\displaystyle P(0<z<.58)$ you can find by chart.

And,

$\displaystyle P(-2.02<z<0)=P(0<z<2.02)$ because the normal curve is symetrrical. And then use the chart.

Heri - Nov 21st 2006, 07:24 AMGoneFishing
So when you get those decimals, do you add them together or subtract them to get the final answer?

- Nov 21st 2006, 07:26 AMThePerfectHacker
- Nov 21st 2006, 07:29 AMGoneFishing
Add or subtract? I'm struggling here. lol The concept of the greater than or less than sign is bothering me, too.

If you have this:

P (z.>2.18) and P (z<1.77)...what is the difference in the final answer? - Nov 21st 2006, 08:33 AMCaptainBlack
See here

RonL