how to create an exponential probability density function how to create the prediction interval what is the prediction interval y in probability density how to calculate bus time prediction interval how do i predict the bus journey how to create a z interval what is the normal deviation for each of the following variables? what does the variable z in a population statistic represent? what is the normal prediction interval how to predict average bus time which variable is used to create a typical interval? what is the normal distribution of the intervals of waiting times for the bus what is the interval in predicting when to use confidence interval as the sum of probability density functions what is the prediction interval which random variable is used when calculating an approximate period of time? what is the confidence interval used to predict l how to make a normal interval what is the confidence interval for the bus in a population if you have a normal and average probability density function for an exponential model what does it mean a prediction interval is used?