An article in geography (july 1980) used regression to predict average annual rainfall levels in california. data on the following variables were collected for 30 meteorological weather stations scattered throughout california. the following is the correlation matrix for annual precipitation and attributes of the weather stations. facing is a dummy variable where 1 indicates the station was on the westward side of the mountains, and 0 indicates the eastern side. the correlation between precipitation and facing is .598. the interpretation of this correlation is