Covariance measures the linear relationship between two variables. The covariance is similar to the correlation between two variables, however, they differ in the following ways: Correlation coefficients are standardized. Thus, a perfect linear relationship results in a coefficient of 1. The correlation measures both the strength and direction of the linear relationship between two variables.
The Largest True Goldfish Ever Caught. The largest true goldfish on record was measured at 5lbs (2.27 kilograms) and was caught by a 16 year old schoolboy in the UK. This blown-up goldfish was evidently a pet before it ended up into a lake.
The World's Biggest Living Species of Fish. The whale shark is the world's biggest fish, and it even sets the record as the largest living nonmammalian vertebrate on land or in the air or water. How big is it? The confirmed largest whale shark was 41.5 feet long and weight about 47,000 pounds.