Some Researchers Have Conjectured That Stem-Pitting Disease in Peach-Tree Seedlings

question 29

Multiple Choice

Some researchers have conjectured that stem-pitting disease in peach-tree seedlings might be controlled with weed and soil treatment.An experiment was conducted to compare peach-tree seedling growth with soil and weeds treated with one of two herbicides.In a field containing twelve seedlings,six were randomly selected throughout the field and assigned to receive Herbicide A.The remaining six were to receive Herbicide B.Soil and weeds for each seedling were treated with the appropriate herbicide,and at the end of the study period the height in centimeters was recorded for each seedling.The following results were obtained. Let W be the Wilcoxon rank sum test statistic equal to the sum of the ranks assigned to the Herbicide A group.Using the Normal approximation,what is the value of the two-sided P-value for the test?

• A)0.0102
• B)0.0125
• C)0.0203
• D)0.0250

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Definitions:

Mycenaean Period

A phase in Greek history (circa 1600–1100 BC) known for its rich tombs, palaces, and the emergence of Greek language and culture.

Relieving Triangle

In Mycenaean architecture, the triangular opening above the lintel that serves to lighten the weight to be carried by the lintel itself.

Dromos

The passage leading to a tholos tomb.

Lintel

A horizontal support across the top of a door or window, often used in architecture to bear the weight of the structure above.