Final answer:
The correct formula to calculate percentage efficiency of sample information is b. EVSI/EVPI*(100%). Efficiency in general is determined by the work output over work input, times 100%.
Step-by-step explanation:
The efficiency of sample information can be mathematically represented. The correct formula is given by the ratio of the Expected Value of Sample Information (EVSI) to the Expected Value of Perfect Information (EVPI), multiplied by 100 to express it as a percentage. In the options provided, the correct answer to the question on how to calculate the percentage efficiency of sample information is b. EVSI/EVPI*(100%).
Efficiency in various contexts, such as engines or simple machines, is typically calculated by comparing the useful output to the total input, and expressing this as a percentage. For a simple machine, for example, the efficiency (Eff) can be calculated as the work output (Wo) divided by the work input (Wi) multiplied by 100%, stated as % efficiency = (Wo/Wi) * 100.