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    stacester115's Avatar
    stacester115 Posts: 1, Reputation: 1
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    #1

    Jul 28, 2007, 04:20 PM
    statistics issue
    Can anyone help me solve this problem?

    Random security checks of 65 travelers at JFK international airport have caused an average of 17 of those travelers to be "red-flagged" for further checks. The population standard devidation is 12 red flags per day.
    1. find 90% confidence interval of the true population mean of red flagged
    2. find 90% " " " " " using a reduced sample of 29 people less
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jul 29, 2007, 02:19 PM


    Find 90% CI.

    This isn't bad.

    The margin of error is given by

    A 90% CI corresponds to a z score of 1.645.

    Now find the margin of error and find and

    The you will have

    Then, for part b, do the same thing with n=36
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