Line graphs are most similar to

true
true
bar charts.
false
histograms.
false
stem and leaf displays.
false
frequency polygons.
A line graph is a bar graph with the tops of the bars represented by points joined by lines.
Line graphs should be avoided when

true
flase
there are more than 10 values on the X-axis.
true
the variable on the X-axis is a qualitative variable.
false
data from more than 3 groups are compared.
Line graphs should not be used with a qualitative variable because line graphs are designed to show trends.