7. Brenda is the owner of Brenda's Hair Salon. She produced the following graph to show that her customers are more satisfied than customers of two nearby salons owned by Nancy and Tammy. Which statement best describes why the graph is misleading? Salon Satisfaction Rating Nancy's Tammy's Brenda's 85% 90% 95% Customer Satisfaction It is difficult to determine the actual satisfaction levels for each salon, so a clear comparison cannot be made. Brenda's ratings look better than they really are because the graph does not start at zero. Using percentages makes it seem like there is a large difference in customer satisfaction between Brenda's Hair Salon and its competitors. Not enough salons were included in the survey.

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: