What is the average height of 300 students in an instructor's class? To determine this, the instructor measures the heights of 30 students selected at random, obtaining a 95% confidence interval for the average height from 64.5 to 67.5 inches. a) In complete sentences, give an interpretation of what this 95% confidence interval for the 300 students' averge height means. We are 95% confident that the average height of all 300 students lies within this interval. We are 95% confdident that the average height of the sample of 30 students lies within this interval There is 95% chance that the height of a student lies within this interval. We are 95% confident that the weight of a student lies within this interval.