A milk company measures a sample of 40 cartons of milk - they determine that the sample mean is 1.97L and the sample standard deviation is 0.29. a. What is the probability that the company will select a carton that is less than 2L? b. What is the probability that the company will select a carton that is in between 1.5L and 1.8L? CONFIDENCE INTERVALS Margin of Error: A range that is given to leave room for errors/ miscalculations p(1 - p) E = Z n Confidence Interval: the range of all possible values when given the confidence level Confidence Level: the probability (level of confidence) that a statistic is correct within a range of values indicated by the margin of error. Confidence Level z-score 90% 1.645 95% 1.960 99% 2.576