Laureysens,et Al

question 55

Multiple Choice

Laureysens,et al.(2004) studied the concentration of aluminum in wood from a number of clones of poplar growing in an area with heavy pollution.The same clone was sampled and tested once in August and again in November.The researchers believed that the concentration of aluminum would be shown to be increasing over time and hence higher in November than in August.The following table gives the aluminum concentrations for twelve of the clones. The data are to be analyzed using the Wilcoxon signed rank test.The null hypothesis they established was that the values of aluminum concentrations in the 2 months have the same distribution.Using the Normal approximation,what is the value of the test statistic used in testing the null hypothesis?

• A)2.00
• B)1.93
• C)3.06
• D)-2.64
• E)Not within ± 0.05 of any of the above

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Definitions:

Horizontal Compression

A tectonic stress that squeezes rock and can lead to the folding or faulting of the earth's crust.

Vertical Compression

The act of applying pressure or force in a downward direction, reducing an object's height or thickness.

Procedural Control

The use of standard operating procedures and guidelines to regulate behavior within organizations, ensuring consistency and compliance.

Managerial Control

The process by which an organization's management ensures that its resources are being used effectively and efficiently in the achievement of the organization's objectives.