Instruction 11-7
an Agronomist Wants to Compare the Crop Yield

question 108

True/False

Instruction 11-7
An agronomist wants to compare the crop yield of three varieties of chickpea seeds. She plants 15 fields, five with each variety. She then measures the crop yield in bushels per acre. Treating this as a completely randomised design, the results are presented in the table that follows.
$\begin{array}{rrrr}\text { Trial}& \text { Smith }& \text { Walsh}& \text { Trevor }\\\hline1 & 11.1 & 19.0 & 14.6 \\2 & 13.5 & 18.0 & 15.7 \\3 & 15.3 & 19.8 & 16.8 \\4 & 14.6 & 19.6 & 16.7 \\5 & 9.8 & 16.6 & 15.2\end{array}$
-Referring to Instruction 11-7,the relative efficiency means that 2.47 times as many observations in each variety group would be needed in a one-way ANOVA design as compared to the randomised block design in order to obtain the same precision for comparison of the variety means.

---

Definitions:

Bipolar Disorder

A mental disorder marked by extreme mood swings, including manic (high) and depressive (low) episodes.

Prevalence

The proportion of a population found to have a condition at a specific time.

Lithium

A chemical element used as a medication to treat and prevent mania, bipolar disorder, and other mood disorders.

Mood Disorders

Psychological disorders characterized by the elevation or lowering of a person's mood, such as depression or bipolar disorder.