Consider the Accompanying Contingency Table $\begin{array}{c|ccc} & {\text { Column }} \\\text { Row } & 1 & 2 & 3 \\\hline 1 & 13 & 15 & 16 \\2 & 19 & 26 & 11\end{array}$

question 54

Essay

Consider the accompanying contingency table. $\begin{array}{c|ccc} & {\text { Column }} \\\text { Row } & 1 & 2 & 3 \\\hline 1 & 13 & 15 & 16 \\2 & 19 & 26 & 11\end{array}$

a. Convert the values in row 1 to percentages by calculating the percentage of each column total falling in row $1 .$
b. Create a bar graph with row 1 percentage on the vertical axis and column number on the horizontal axis.
c. What pattern do you expect to see if the rows and columns are not independent? Is this pattern present in your graph?

---

Definitions:

Microelectrode

A very small electrode used to measure electrical activity in tissues such as the brain or muscles, often in neuroscience research.

Axon

A long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body.

Electroencephalogram

A diagnostic test that measures electrical activity in the brain using small electrodes attached to the scalp.

Richard Caton

A British physician who pioneered the study of electrical activity in the brain, leading to the development of electroencephalography.