You can, but it depends on what you hope to show. A bar graph, showing the numbers or proportions of people within height bands may be a more effective visual display.
Yes, because a line graph deals with change over time, and so does height.
Yes, because a line graph deals with change over time, and so does height.
yes
You would not use a graph to determine one person's height at a single point in time. You could use a line graph to track the height of a person over time. You could use a histogram to determine the heights of lots of people at one time.
data
line graph
A scatter graph - unless the relationship is exact. If so, use a line (which need not be a straight line).
line graph
A line graph.A line graph.A line graph.A line graph.
when both of your variables are continuous sets of data
Creating a line graph is a simple thing to do. If you have two points, you can create a line graph.
a line graph is tracking something over time.