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.
You're gonna need a bigger tank! Meet Big Bob, the foot-long goldfish who keeps outgrowing his home (and is STILL getting larger) 'Big Bob' was bought as an inch-long goldfish from Scarborough pet shop. But Anne Cooper, 56, has seen him outgrow four fish tanks in three years. Bob is so big he scares Ms Cooper's two cats away by thrashing around. Ms Cooper said he gets violent if not fed on time and hates the colour red.