Please Help Me!! Will Medal!!

The standard normal curve shown here is a probability density curve for a continuous random variable. This means that the area underneath the entire curve is 1. What is the area of the shaded region between the two z-scores indicated in the diagram?

Question

Please Help Me!! Will Medal!!

The standard normal curve shown here is a probability density curve for a continuous random variable. This means that the area underneath the entire curve is 1. What is the area of the shaded region between the two z-scores indicated in the diagram?

anonymous · Answer

attachment

kirbykirby · Answer

Do you have a certain standard normal table that you use?

kirbykirby · Answer

You can use any one you find online, but just beware that not all of them are constructed in the same way (Some give you CDF values, some give you values for negative z scores only, etc.)

anonymous · Answer

I don't have one:/ I think this is just a regular table.

anonymous · Answer

Okay what I got was .11123 and .80511

kirbykirby · Answer

http://condor.wesleyan.edu/hsinnamon/wescourses/Psyc200/Tables/TableA_StandardNormal_.bmp Let's say we are using this one

anonymous · Answer

I do not know if that is right for the numbers on that round thing

anonymous · Answer

Yours does not have the negatives tho..

kirbykirby · Answer

It doesn't matter, You can use any standard normal table. You rely on the fact that it is symmetric to find the negative values.

anonymous · Answer

well what about the #'s I provided with the table I used?

anonymous · Answer

Nevermind....for your table you provided I got .8907 and .8051

anonymous · Answer

then what??

kirbykirby · Answer

your values might be good might I didn't look at a negative z-value table. is the 0.11123 the CDF value from -infinity to -1.23?

kirbykirby · Answer

I'll try and draw it:

kirbykirby · Answer

|dw:1401984697116:dw|

kirbykirby · Answer

|dw:1401984737592:dw|