anonymous
  • anonymous
Let be a standard normal random variable. Use the calculator to determine the value of such that P(-c<=Z<=c)=.9265
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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DebbieG
  • DebbieG
Well, remember that the normal distribution is symmetric: |dw:1434763714199:dw|
anonymous
  • anonymous
right so you divide it by 2
anonymous
  • anonymous
now why did you add +.5?

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DebbieG
  • DebbieG
The area between the mean (0) and c is .9265/2. And the area to the left of the mean is 0.5. So you need c such that the area to the left of c (the total area) is 0.96325
DebbieG
  • DebbieG
I think you use the inverse normal function in your calculator. I am not really familiar with doing them via calculator so I'd probably have to look up how to actually enter it... lol.
anonymous
  • anonymous
lol we were actually taught on doing it on the calculator
anonymous
  • anonymous
i think i would just do p(z<=.96325)
DebbieG
  • DebbieG
Yes, that should work. I used invNorm(0.96325,0,1) and got 1.7897
DebbieG
  • DebbieG
Can also use an online calculator like this one: http://stattrek.com/online-calculator/normal.aspx
anonymous
  • anonymous
weird i got .8323

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