If f(x) = (x + 1) ^ (- 1) and g(x) = x - 2 , what is the domain of f(x) / (g(x)) )?
a. all values of x
b. (- infty,-,2) , and (2, infty)
c. (- infty,2) ) and (2, infty)
d. (- infty,-1] and [2, infty)

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: