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 evaluate the effectiveness of the two agencies. andy proposes an a/b test that compares the click-through rates per ad for the two agencies. brad proposes a difference-in-difference test in which the budgets for both agencies are increased by 50% and the percent change in click-through rates are compared. what might be the sources of selection bias for the two proposals? which is likely to be smaller?

Juwana was turned down for a car loan by a local credit union she thought her credit was good what should her first step be

Precision dyes is analyzing two machines to determine which one it should purchase. the company requires a rate of return of 15 percent and uses straight-line depreciation to a zero book value over the life of its equipment. ignore bonus depreciation. machine a has a cost of $462,000, annual aftertax cash outflows of $46,200, and a four-year life. machine b costs $898,000, has annual aftertax cash outflows of $16,500, and has a seven-year life. whichever machine is purchased will be replaced at the end of its useful life. which machine should the company purchase and how much less is that machine's eac as compared to the other machine's

Manipulation manufacturing's (amm) standards anticipate that there will be 5 pounds of raw material used for every unit of finished goods produced. amm began the month of maymay with 8,000 pounds of raw material, purchased 25,500 pounds for $ 15,300 and ended the month with 7,400 pounds on hand. the company produced 4,9004,900 units of finished goods. the company estimates standard costs at $ 1.10 per pound. the materials price and efficiency variances for the month of maymay were: