ESS210B
Prof. Jin-Yi Yu
Confidence Intervals (or Limits)
qIn stead of asking “what is the probability that Z falls within limits a and b in the normal distribution”, it is more important to ask “Within what intervals or limits does X% of the population lie in the normal distribution”.
qThe X% is referred as the “confidence level”.
qThe interval correspond to this level is called the “confidence intervals” or “confidence limits”.