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

question 7

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 value of z,the standardized value of W?

• A)0.37
• B)1.76
• C)2.24
• D)2.32

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Definitions:

Grocery Bills

The total amount of money spent on purchasing food and other items from a grocery store.

Bank Statement

A summary of financial transactions that occurred over a period on a bank account.

Checking Account

A bank account that allows the holder to deposit and withdraw money, and write cheques for payment.

Histogram

A graphical representation of the distribution of numerical data, where the data is divided into bins and the frequency of the data in each bin is depicted through the height of the bar.