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anonymous

  • one year ago

Let be a standard normal random variable. Use the calculator to determine the value of such that P(-c<=Z<=c)=.9265

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  1. DebbieG
    • one year ago
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    Well, remember that the normal distribution is symmetric: |dw:1434763714199:dw|

  2. anonymous
    • one year ago
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    right so you divide it by 2

  3. anonymous
    • one year ago
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    now why did you add +.5?

  4. DebbieG
    • one year ago
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    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

  5. DebbieG
    • one year ago
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    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.

  6. anonymous
    • one year ago
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    lol we were actually taught on doing it on the calculator

  7. anonymous
    • one year ago
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    i think i would just do p(z<=.96325)

  8. DebbieG
    • one year ago
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    Yes, that should work. I used invNorm(0.96325,0,1) and got 1.7897

  9. DebbieG
    • one year ago
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    Can also use an online calculator like this one: http://stattrek.com/online-calculator/normal.aspx

  10. anonymous
    • one year ago
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    weird i got .8323

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