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    Graphing and Interpreting Data

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    Your firm is located in a 10-story building. Each floor has its own Xerox machine in a
    copy room. The firm owns these machines but must pay for paper, toner, and occasional
    maintenance. Each employee has a key that opens the copy room door on his or her
    floor only and does not have access to Xerox machines on other floors.
    Because the Xerox machines are "free goods" right now, you suspect that the firm's
    Xerox costs could be cut pretty drastically. To test this theory, you have decided to perform
    an experiment. Each person on the 10th floor has been given a card that operates
    the 10th-floor machine. These employees have been told that their card will generate a
    daily accounting of their Xerox activity. Tenth-floor employees have also been told that
    they will not be charged for their use of the machine, but they certainly know that someone
    will have some sense of individual usage patterns.
    To establish a basis of comparison, the group on the third floor has not been converted
    to the card system. The third-floor machine has an internal mechanism that totals
    the number of copies made each day, but you do not know who is doing what, and the
    third-floor employees have no reason to believe that they are being monitored. The 3rd
    and 10th floors have been chosen for this experiment because these two floors have had
    about the same usage rates in the past.
    You have collected data from the two machines over the last 50 working days. The
    data are on the accompanying CD in the file named XEROX. This file has 50 observations
    and three variables:
    766 CASES
    Variable Label
    DAY An indicator of the day data were extracted.
    TENTH The number of Xerox copies made on the 10th floor.
    THIRD The number of copies made on the 3rd floor.

    1. Use appropriate graphical or statistical techniques to determine whether the card
    accounting system will effectively lower inappropriate Xerox usage if implemented
    companywide.

    keywords: z-tests, levels, significance

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