Which is not a correct description of the graph below? The graph shows a sine wave with a minimum value of negative 1 and a maximum value of 1. The wave completes 1 cycle in an interval from 0 to 2 pi. The wave passes through (0, 0), slopes down and hits a minimum value of negative 1 at pi over 2, has a value of 0 again at pi, hits a maximum value of 1 at 3 pi over 2 and has a value of 0 again at 2 pi. the graph of shifted to the left by units the graph of shifted to the left by units shifted to the left by units

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: