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    aishah harun's Avatar
    aishah harun Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Jun 9, 2012, 11:21 AM
    A sample of 25 male teenagers who shopped at a bookstore showed that they spent an av
    A sample of 25 male teenagers who shopped at a bookstore showed that they spent an average of RM44 with a standard deviation of RM11. Another sample of 22 female teenagers who shopped at the store showed that they spent an average of RM49 with a standard deviation of RM9. Assuming both population of spending amounts are normally distributed, construct the 99% confidence interval for the difference between the mean amounts spent by all male and female customers at this store. Interpret the interval.
    Curlyben's Avatar
    Curlyben Posts: 18,514, Reputation: 1860
    BossMan
    		  
    #2

    Jun 9, 2012, 12:54 PM
    What do YOU think ?
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