<s>[INST] Both Barbara and Mike are farmers. They participate in the weekly auctions to buy and sell cattle. Mike has been noticing that over time his cattle have been performing higher than Barbara's, relative to the expected output. This has resulted in Mike receiving higher bids for his cattle. Consequently, Mike started to expand his farm and ventured into adding more cattle to his herd. Barbara cannot understand why Mike's cattle are producing a higher yield even though solid information regarding agricultural practices and the environment are available to both farmers. Barbara suspects that the size of Mike's farm could be a factor contributing to the difference, and the size can be measured. But, she also suspects that the size of Mike's farm is related to the cattle herd's yields that Mike receives. This scenario can be described by which of the following statistical terms?[/INST]