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Homework Help: Distribution Plot

  1. Aug 3, 2010 #1
    The problem statement, all variables and given/known data
    Normal: mean = 0 standard deviation = 1
    distribution plot.JPG
    Is it:
    10th percentile of standard normal distribution is -1.28
    10th upper percentile of standard normal distribution is 0.1
    90th percentile of standard normal distribution is -1.28
    10th percentile of standard normal distribution is 1.28

    The attempt at a solution

    Area under the curve is the Population, at the center or x is the mean, let [tex]\alpha[/tex]/2 be the area shaded in red.


    ...lost. I know that in standard normal distribution N(mean, variance) = N(0,1) and to get the confidence interval = 1 - [tex]\alpha[/tex] = 0.1 which would be 90% (to the left)

    I think it would be 10th upper percentile (to the right)
     
  2. jcsd
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