For six local offices of a large tax preparation firm, the following data describe x 5 service revenues and y 5 expenses for supplies, freight, and postage during the previous tax preparation season:
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x 5ppm,
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y 5 ppm,
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x 5 ppm,
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y 5 ppm,
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x 5 Service Revenues
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y 5 Supplies, Freight, Postage
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Plain Text
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Graphics
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Plain Text
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Graphics
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(Thousands)
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(Thousands)
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30.0
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20.0
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26.0
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17.0
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$351.4
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$18.4
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33.0
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31.0
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7.5
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4.5
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291.3
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15.8
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28.0
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23.0
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27.0
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19.0
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325.0
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19.3
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32.0
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24.0
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34.0
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33.0
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422.7
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22.5
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8.4
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5.6
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33.0
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32.0
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238.1
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16.0
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514.5
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24.6
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a. Draw a scatter diagram representing these data.
b. Using the "eyeball" method, fit a straight line to the data.
c. Does there appear to be any relationship between the variables? If so, is the relationship direct or inverse?