anonymous
  • anonymous
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?
Statistics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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jim_thompson5910
  • jim_thompson5910
go ahead
anonymous
  • anonymous
The shaded area is z= .18
anonymous
  • anonymous
mean 0 and standard deviation is 1

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jim_thompson5910
  • jim_thompson5910
so it gave you a probability 0.18 and it wants you to find a z-score? or the other way around?
anonymous
  • anonymous
find the area of the shaded region. the graph depicts the Standard normal distribution with mean 0 and SD 1.
anonymous
  • anonymous
The area of the shaded region is......
jim_thompson5910
  • jim_thompson5910
ok so it sounds like they gave you a z score of z = 0.18
jim_thompson5910
  • jim_thompson5910
how is the shaded region set up? to the right of the z-score? or to the left?
anonymous
  • anonymous
to the left
jim_thompson5910
  • jim_thompson5910
ok so you can use a table like this one https://www.stat.tamu.edu/~lzhou/stat302/standardnormaltable.pdf
jim_thompson5910
  • jim_thompson5910
locate the row that starts with 0.1 (on page 2)
jim_thompson5910
  • jim_thompson5910
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
anonymous
  • anonymous
OMG!!!! Thank you so much!!! You're a lifesaver. I've been sitting here trying everything!
anonymous
  • anonymous
I should be able to use the chart for all z score problems, correct?
jim_thompson5910
  • jim_thompson5910
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
jim_thompson5910
  • jim_thompson5910
tables like these should be found in the back of your stats book in the appendix
anonymous
  • anonymous
Ok. Thank you again!
jim_thompson5910
  • jim_thompson5910
you're welcome

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