Alevel Maths question

Do you mean there is a significant difference in the data or do you been there is a significant correletion between the variables?

Significance is a term used to state that any pattern in any data is not due to chance alone. It isn't just random coincidence. And it is usually backed up by a statistical test, such as Student t test or chi squared test.

Right so if something is not significant it is due to chance?

are you asking informally, or trying to answer a specific question.

"not significant" is normally used in hypothesis tests to state that there is insufficient evidence to argue that the observed outcome(s) aren't likely to occur by chance under the null hypothesis [whatever that happens to be], so it's a little more technical than your post might suggest

Yes, either the difference in the data is not different enough to be significant (eg plant leaves in shade and plant leaves in light are not significantly different enough in size and shape to be proved to be caused by the light differences)
or there is no significant correlantion between two sets of data ( eg numbers of daisies do not drop significantly across a trampled area and so trampling isn't causing a change)

so if it is not significant then any differences you happen to have are due to random chance