In an experiment, the observations always have some kind of random error. It could also be that the relationship between the variables is such that it can't be represented by a smooth line.
If the data points do form a perfectly smooth line, you have probably 'cooked' the results, and it will be obvious that you haven't performed the experiment!
A graph has to be clearly labelled and drawn for clarity and to aid the correct interpretation of the data shown on the graph.
A scatter plot would be best for non-related data points. A line graph would be best for related data points.
Line graph...
line graph
Scatterplot
The line of a graph is quite often used to indicate the average of various data points that fall both above and below the line. Very jagged lines get smoothed out, but the trend is the same.
line of best fit x
A graph has to be clearly labelled and drawn for clarity and to aid the correct interpretation of the data shown on the graph.
A scatter plot would be best for non-related data points. A line graph would be best for related data points.
A discrete graph.
Line graph...
linear graph
either a scatter graph or a line graph xx :)
Any kind of properly drawn graph does. That's what graphs do.
It depends on what you are trying to do.
Maths
A line graph is used to display data over time with points connected by lines. This type of graph highlights trends and patterns in the data.