the neighborhood clinkos has a single copy machine. the copier has been observed on average 16 customers per hour during peak periods when it is never idle.; the servie time of this copier is exponentially distributed. customers arrive at the copir according to a poisson process with a mean of 12 customers per hour. what is the coefficient of variation of the customer interarrival time

You are in charge of the customer service phone line with many employees. at the end of each phone callthe customers are asked to rate their service from 1 to 5 stars, with 5 being the best. you find the averagerating for 20 randomly selected employees and decide you want to improve the ratings so you require thoseemployees to go through a new training program. you then wait a week and find the new average rating foreach employee. the average change is an increase in 1.3 stars with a standard devation of .9 stars.(a) is this data paired or not paired? (b) what are the null and alternative hypothesis being tested? (c) what is the t-statistic you would use? write the general formula and the final calculation.(d) sketch a t-distribution, label your t-statistic and the probability you would be interested in: