Question

Does anyone know about z scores? I am having a hard time. On some of the questions, I get part of it, but don't know how to finish the problem. Can anyone help me,please?

Answer 1

go ahead

Answer 2

The shaded area is z= .18

Answer 3

mean 0 and standard deviation is 1

Answer 4

so it gave you a probability 0.18 and it wants you to find a z-score?

or the other way around?

Answer 5

find the area of the shaded region. the graph depicts the Standard normal distribution with mean 0 and SD 1.

Answer 6

The area of the shaded region is......

Answer 7

ok so it sounds like they gave you a z score of z = 0.18

Answer 8

how is the shaded region set up? to the right of the z-score? or to the left?

Answer 9

to the left

Answer 10

ok so you can use a table like this one

https://www.stat.tamu.edu/~lzhou/stat302/standardnormaltable.pdf

Answer 11

locate the row that starts with 0.1 (on page 2)

Answer 12

then find the column that has 0.08 up at the top

the intersection of the "0.1" row and "0.08" column has 0.57142 in the cell

so that means P(Z < 0.18) = 0.57142

Answer 13

OMG!!!! Thank you so much!!! You're a lifesaver. I've been sitting here trying everything!

Answer 14

I should be able to use the chart for all z score problems, correct?

Answer 15

Yes that is correct. You can also use a TI83 or TI84 calculator to do the same thing more or less. The calculator allows you to use values not found on the table

you use the normalcdf function

Answer 16

tables like these should be found in the back of your stats book in the appendix

Answer 17

Ok. Thank you again!

Answer 18

you're welcome