A qualitative variable with three classes (X, Y, and Z) is measured for each of 20 units randomly sampled from a target population. The data (observed class for each unit) are as follows:
Y | X | X | Z | X | Y | Y | Y | X | X | Z | X | Y | Y | X | Z | Y | Y | Y | X |
a. Compute the frequency for each of the three classes.
b. Compute the relative frequency for each of the three classes.
c. Display the results from part a in a frequency bar graph.
d. Display the results from part b in a pie chart.
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