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    yellow123's Avatar
    yellow123 Posts: 8, Reputation: 1
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    #1

    Apr 4, 2011, 07:11 PM
    Statistic
    For a normal distribution, identify the z-score location that would separate the distribution into two sections so that there is
    a) 70% in the body on the right hand side
    b) 80% in the body on the right hand side
    c) 75% in the body on the left hand side
    d) 90% in the body on the left hand side
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Apr 5, 2011, 07:10 AM

    a. look up the z score corresponding to a .70 in the body of the table.

    b. same as above only look up .20

    c. z scores come from the left and go right. So, just look up .75 in the body of the table

    d. look up .90

    These are just exercises in locating z scores and reading the z table.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #3

    Apr 5, 2011, 12:15 PM

    Also, draw a picture of each of the distributions and the percentages concerned. There are z values which will be negative.
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