The residential division of prism's high-speed internet service uses one advertising agency, while its commercial division uses another. two analysts, andy and brad, are asked to test the effectiveness of the two agencies. andy proposes an a/b test that compares the click-through rates per ad of the two agencies. brad proposes a difference-in-difference test in which the budgets for both agencies are increased by 50%, and the percentage changes in the click-through rates are compared. true or false: andy's proposal is more likely than brad's to suffer from bias due to issues with "representativeness."

When the federal reserve buys and sells bonds to member banks, it is called a. monetary policy b. reserve ratio c. interest rate adjustment d. open market operations

M. cotteleer electronics supplies microcomputer circuitry to a company that incorporates microprocessors into refrigerators and other home appliances. one of the components has an annual demand of 235 units, and this is constant throughout the year. carrying cost is estimated to be $1.25 per unit per year, and the ordering (setup) cost is $21 per order. a) to minimize cost, how many units should be ordered each time an order is placed? b) how many orders per year are needed with the optimal policy? c) what is the average inventory if costs are minimized? d) suppose that the ordering cost is not $21, and cotteleer has been ordering 125 units each time an order is placed. for this order policy (of q = 125) to be optimal, determine what the ordering cost would have to be.

Describe how to write a main idea expressed as a bottom-line statement