TABLE 12-19
an Agronomist Wants to Compare the Crop

question 150

Short Answer

TABLE 12-19
An agronomist wants to compare the crop yield of 3 varieties of chickpea seeds. She plants all 3 varieties of the seeds on each of 5 different patches of fields. She then measures the crop yield in bushels per acre. Treating this as a randomized block design, the results are presented in the table that follows.
$$\begin{array} { l l l l } \underline{\text { Fields} } & \underline{\text { Smith} } &\underline{ \text { Walsh }} &\underline{ \text { Trevor } }\\1 & 11.1 & 19.0 & 14.6 \\2 & 13.5 & 18.0 & 15.7 \\3 & 15.3 & 19.8 & 16.8 \\4 & 14.6 & 19.6 & 16.7 \\5 & 9.8 & 16.6 & 15.2\end{array}$$ Below is the Minitab output of the Friedman rank test:
Friedman Test: Yield versus Varieties, Fields
Friedman test for Yield by Varieties blocked by Fields
$\mathrm{s}= 10.00$ $\quad$$\mathrm{DF}=2 \quad \mathrm{P}=0.007$

$\begin{array}{llcc} & \text { Est } & \text { Sum of } \\ \text { Varieties } & \text { N } & \text { Median } & \text { Ranks } \\ \text { Smith } & 5 & 13.500 & 5.0 \\ \text { Trevor } & 5 & 15.667 & 10.0 \\ \text { Walsh } & 5 & 18.533 & 15.0 \\\\ \text { Grand median= } & 15.900\end{array}$

-Referring to Table 12-19, what is the critical value of the Friedman rank test for the difference in the medians at a level of significance of 0.01?

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Definitions:

Abnormality

A deviation from the average or norm, often used in the context of behaviors or conditions that are outside societal expectations or statistical averages.

Acceptable in a Culture

Behaviors, practices, or beliefs that are considered appropriate and conform to the norms within a specific culture.

Old Junk

Derogatory term for objects that are considered useless or of little value, often accumulated over time and cluttering space.

Psychological Approach

A perspective in psychology that emphasizes the role of mental functions in understanding human behavior.