Hasan plans to choose a book from a section of the store where everything is 25%25% off. he writes the expression d−0.25dd-0.25d to find the sale price of the book if the original price is dd dollars. bella correctly writes another expression, 0.75d0.75d, that will also find the sale price of the book if the original price is dd dollars. use the drop-down menus to explain what each part of hasan's and bella's expressions mean.

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: