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    tereskal's Avatar
    tereskal Posts: 4, Reputation: 1
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    #1

    Feb 4, 2009, 07:48 PM
    Confidence interval
    A researcher claims that the average age of people who buy lottery tickets is 70. A sample of 30 is selected and their ages are recorded as shown below. The standard deviation is 16 at alpha+0.05 is there enough evidence to reject the researcher's claim
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Feb 4, 2009, 08:11 PM
    What seems to be your difficulty?

    What ages shown below? How can we help if the problem is incomplete? We need the sample mean.
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