Question: What is the implied meaning of a 'confidence level of 95%' in the context of measurement uncertainty tolerance intervals for test equipment in Telecommunication networks, specifically regarding RF tests?
Option 1: It ensures that 95% of all measurements taken by the test equipment will be accurate to the specified value without any margin of error.
Option 2: It signifies that the specified measurement uncertainty range captures 95% of the performance variability across a population of identical test equipment setups.
Option 3: This level dictates that test equipment must operate at 95% capacity to achieve reliable measurements during RF tests.
Option 4: It means that there's a 5% chance of measurement error exceeding the specified uncertainty values when testing with a nominal 50 ohm load.
Explanation: The correct interpretation of a 'confidence level of 95%' in this context is that it defines the interval within which 95% of the measurements (or performance) of a population of test equipment are expected to fall. This does not imply an error-free guarantee for all measurements, nor does it relate to operational capacity, or directly imply a 5% error chance in exceeding uncertainty values under specific conditions. Instead, it statistically bounds the variability in measurement outcomes across multiple instances of test equipment.