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·All problem numbers refer to the problem from Dean, Voss, and Dragulijic (DVD)


·Please summarize your results from statistical software such as R or SAS




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Answer To: Ebook- https://ebookcentral.proquest.com/lib/gwu/detail.action?docID=6315198 user name: faynguyen18...

Sanchi answered on Mar 12 2021
164 Votes
1. Zinc plating experiment
The following experiment was used by C. R. Hicks (1965), Industrial Qua
lity Control, to illustrate the possible bias caused by ignoring an important covariate. The experimental units consisted of 12 steel brackets. Four steel brackets were sent to each of three vendors to be zinc plated. The response variable was the thickness of the zinc plating, in hundred-thousandths of an inch. The thickness of each bracket before plating was measured as a covariate. The data are reproduced in Table 9.8.
    vendor
    vendor
    vendor
    1
    2
    3
    x
    y
    x
    y
    x
    y
    110
    40
    60
    25
    62
    27
    75
    38
    75
    32
    90
    24
    93
    30
    38
    13
    45
    20
    98
    47
    140
    35
    59
    13
a) Plot yit versus xit, using the vendor index i as the plotting symbol. Discuss the relationship between plating thickness and bracket thickness before plating. Based on the plot,...
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