Outlier
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extremely high
Very tall
A correlation coefficient of 1 or -1 would be the highest possible statistical relationship. However, the calculation of correlation coefficients between non independent values or small sets of data may show high coefficients when no relationship exists.
Climax, peaking, and topping-out are terms that mean 'reaching a high point'.
Although copper is a common metal in the United States, its is one of the most commonly used metals, and the demand for it is extremely high. According to livescience.com, the high demand drove the price of copper higher. The spike, according to the website, came in the early 2000s.