Acompany sells two versions of an antivirus software. the home edition costs $23.50, and the business edition costs $58.75. last week, the
company earned $29,668.75 from selling 745 copies of the software.
if x represents the number of copies of the home edition sold and y represents the number of copies of the business edition sold, which system
of equations represents this situation?

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: