Smart is someone that knows a lot. Niceness is someone that is friendly to others.
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Is someone smart more likely to be nice? Is someone nice more likely to be smart? Good questions! My hunch is that if there is a correlation, it would be a weak one.
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There is no correlation.
correlation implies the cause and effect relationship,, but casuality doesn't imply correlation.
Positive correlation has a positive slope and negative correlation has a negative slope.
If measurements are taken for two (or more) variable for a sample , then the correlation between the variables are the sample correlation. If the sample is representative then the sample correlation will be a good estimate of the true population correlation.
a zero correlation means that there is no relationship between the two or more variables.