The Following Data Shows the Yield, in Bushels Per Acre

question 174

Essay

The following data shows the yield, in bushels per acre, categorized according to three
varieties of corn and three different soil conditions. Assume that yields are not affected by an
interaction between variety and soil conditions, and test the null hypothesis that variety has no
effect on yield. Use a 0.05 significance level. $$\begin{array} { c | c c c } & \text { Plot 1 } & \text { Plot 2 } & \text { Plot 3 } \\\hline \text { Variety 1 } & 156,167 , & 162,160 , & 145,151 , \\& 170,162 & 169,168 & 148,155 \\\text { Variety 2 } & 172,176 , & 179,186 , & 161,162 , \\& 166,179 & 160,176 & 165,170 \\\text { Variety 3 } & 175,157 , & 178,170 , & 169,165 , \\& 179,178 & 172,174 & 170,169\end{array}$$

---

Definitions:

Weathering Type

Classification of the processes by which rocks and minerals are broken down into smaller pieces and changed chemically under Earth's surface conditions, including physical, chemical, and biological weathering.

Shape

The external form or appearance of an object or figure, defined by its outline or surface configuration.

Clasts

Fragments of geological detritus, rocks, or minerals broken off from a larger solid formation, typically found in sedimentary rocks.

Wind

Movement of air relative to Earth’s surface.