A result is statistically significant if:
it is unlikely to have occurred by chance
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"Statistically significant" means that the result is beyond the element of chance.
No, it is not.
There is nothing particularly significant about a sample size of 30.
This question lacks the details to make any judgement.
Correlation analysis. But you will need a lot more knowledge of statistics before you can decide whether the result is [statistically] significant or not, and if it is, what that means.