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.
Observe its size. If kept in proper tank or pond conditions, a common goldfish will be around 5 inches (12.7 cm) after a year and 9 inches (22.9 cm) after two years. You can eye your goldfish to see how large it has become. If you keep your goldfish in a small bowl, you may find that its growth is stunted.