A qualitative variable is
A categorical or qualitative variable is one in which responses are classified according to which category they are in. There is no numeric ranking of the categories.
false
sometimes measured on a continuous scale.
true
a categorical variable.
false
a numeric variable.
false
When there are many categories, it is best to use a
Pie charts are not good for displaying many categories. Horizontal bar charts are usually better than vertical bar charts because there is more room to label the categories.
false
pie chart.
true
horizontal bar chart.
vertical bar chart.
false
false
When you have relatively few observations you should use percentages rather than frequencies.
Percentages can be misleading when you have relatively few observations. They can make a small difference look large.
false
true
true
false
false
A graph with a large lie factor
false
omits data that do not fit the hypothesis.
false
is distorted because the baseline is not zero.
true
greatly exaggerates differences by comparing areas instead of heights.
false
Although all of these choices refer to misleading ways that graphs can be constructed, the term "lie factor" refers to the ratio of the size of the effect shown in a graph to the size of the effect shown in the data. When relevant pictures, as opposed to simple bars, are used in graphs, the heights of these pictures may accurately portray the data, but their area differences could be extremely misleading.
Three-dimensional bar charts make it easier to interpret the data.
false
true
true
false
In general, it is a bad idea to have more display dimensions than data dimensions. Three-dimensional bar charts are not as clear as two-dimensional bar charts.