Notice that in this case (as in many cases), population does not refer to people, but to bags of potato chips. To be concise, researchers often use symbols in place of words. Greek letters are usually used when referring to populations (the entire group being studied, from which a sample or samples will be drawn).
A blood test is needed to determine the effect of warfarin for each person and this is measured as the International Normalised Ratio or INR. The INR is a measure of how long it takes for blood to clot. The INR for a person not taking warfarin is 1. The higher the INR, the longer it takes for blood to clot. The desired INR for you will depend on the reason for which you are taking warfarin. Your doctors will try and keep your INR within a range â called the target INR range.
DEFINITION of 'Internal Rate Of Return-IRR'. A metric used in capital budgeting measuring the profitability of potential investments. Internal rate of return is a discount rate that makes the net present value (NPV) of all cash flows from a particular project equal to zero. IRR calculations rely on the same formula as NPV does.