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

question 14

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.What is the observed value of W?

• A)24.5
• B)52.0
• C)53.5
• D)54.5

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Definitions:

Electrical Noise Interference

Unwanted disturbances superimposed on a useful signal that tend to obscure its information content, often caused by electromagnetic disturbances.

Logic Circuits

Electronic circuits that implement logical functions, they are the building blocks of digital devices, able to process binary data input into specific outputs.

I/O System

An Input/Output System is the component of a computer or PLC responsible for communication with the external environment through devices like sensors and actuators.

CPU

A CPU, or Central Processing Unit, is the primary component of a computer responsible for interpreting and executing instructions and running software.