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Chapter 2: Q. 2.127 (page 80)
Distribution of a variable.
A variable's distribution is a description of the relative frequency with which each conceivable outcome will occur in a set of trials.
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We have drawn a smooth curve that represents a distribution,
a. Identify the shape of the distirbution with regard to modality.
b. Identify the shape of the distribution with regard to symmetry (or non symmetry)
c . If the distribution is unimodal and non symmetric, classify it as either right skewed or left skewed.
As mentioned, for relative-frequency polygons, we label the horizontal axis with class marks in limit grouping and class midpoints in cut point grouping. How do you think the horizontal axis is labeled in single-value grouping.
Sample distribution.
This exercise deals with truncated graphs.
a. What is a truncated graph?
b. Give a legitimate motive for truncating the axis of a graph.
c. If you have a legitimate motive for truncating the axis of a graph, how can you correctly obtain that objective without creating the possibility of misinterpretation?
Residential Energy Consumption. Construct a relative frequency polygon for the energy-consumption data given in Exercise Use the classes specified in that exercise.
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