### What is the difference between a data marker and data label?

On a chart, such as a line chart, a data markers shows where the point is, usually done with a dot or a box or a cross. A data label will show the actual value of that data point. So on a line chart you might see a data marker on the line to indicate it is a value from the data and with it a data label will tell you what the actual value…

### Why doesn't the data points always fall on the line you draw on a graph?

There can be a few reasons. One reason is that the line is wrong, either it has been placed wrong or it is the wrong type of line (linear when it should be exponential) there may even be no line to fit the pattern. Another reason is that simply the real world data points don't fit a correlation exactly, this is why the line is referred to as a "line of best fit" it is…

### What is a best fit graph is?

A best fit graph to some data is exactly that: it is a line which fits the data best according to some optimality criterion. There is a always a trade off in fitting a line to data: one can change the number of degrees of freedom of the underlying equation, which affects how close the line can get to the data points. With more degrees of freedom, the line can more closely approximate the data…

### What provides greater power conditioning and protection between surge protector an ups?

In their simplest forms, neither a surge protector nor an un-interruptable power supply provide any power conditioning. Both have specific tasks to perform. A surge protector is designed to prevent voltage spikes being passed along a power line and is set to trigger at a certain threshold voltage. A UPS is designed to deliver power to a device or to a mains circuit in the event that the incoming mains power supply fails. Both surge…