What is the difference between a positive correlation and a negative correlation

Question

What is the difference between a positive correlation and a negative correlation? Give an example of each. In 1998, a study published in the prestigious British medical journal Lancet claimed to show a positive correlation between the incidence of autism and MMR (measles, mumps, rubella) vaccinations. That is, as the rate of MMR vaccination increased, so did autism. Given this information, can it be concluded that MMR vaccinations cause autism? There is more to this study that the public should be aware of. Research the name of the lead researcher of this study, Andrew Wakefield, and in a one or two paragraph summary, explain what happened regarding this study. Is there any credible evidence that the MMR vaccine causes autism? Use and cite credible sources in your summary and your answer to this question.

Explanation / Answer

6) Correlation is a statistical relationship between two variables it can be causal or not.
Positive correlation : Positive correlation is when the correlation is in same direction, that is, one variable increases when other increases and vice versa. Example : Length of a solid metal bar increases as temperature increases below melting point.
   Negative correlation : Negative correlation is when the correlation is in opposite direction, that is, on variable decreasis when other increases. Example : Volume of gas decreases as pressure increases.

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