Suppose the mean wait-time for a telephone reservation agent at a large airline is 45 seconds. a manager with the airline is concerned that business may be lost due to customers having to wait too long for an agent. to address this concern, the manager develops new airline reservation policies that are intended to reduce the amount of time an agent needs to spend with each customer. a random sample of 250 customers results in a sample mean wait-time of 44.1 seconds with a standard deviation of 4.2 seconds. using α = 0.05 level of significance, do you believe the new policies were effective in reducing wait time? do you think the results have any practical significance?

(01.03 mc) which of the following is a step in simplifying the expression x multiplied by y to the power of 2 over x to the power of negative 3 multiplied by y to the power of 3, the whole to the power of negative 4. select one: a. x to the power of negative 4 multiplied by y to the power of negative 2, the whole over x to the power of negative 7 multiplied by y to the power of negative 1. b. x to the power of negative 4 multiplied by y to the power of negative 8, the whole over x to the power of 12 multiplied by y to the power of negative 12. c. x to the power of negative 4 multiplied by y to the power of negative 8, the whole over x to the power of negative 3 multiplied by y to the power of 3. d. x to the power of negative 4 multiplied by y to the power of negative 2, the whole over x to the power of negative 3 multiplied by y to the power of 3.