Wayfair sent five different versions of their email to customers to determine which message was most effective at getting customers to make online purchases. while online sales rose by nearly 20%, two of the versions demonstrated higher than normal click-through rates. such experimentation done in a realistic environment would be called a

You plan to invest some money in a bank account. which of the following banks provides you with the highest effective rate of interest? hint: perhaps this problem requires some calculations. bank 1; 6.1% with annual compounding. bank 2; 6.0% with monthly compounding. bank 3; 6.0% with annual compounding. bank 4; 6.0% with quarterly compounding. bank 5; 6.0% with daily (365-day) compounding.

Suppose that a major city’s main thoroughfare, which is also an interstate highway, will be completely closed to traffic for two years, from january 2014 to december 2015, for reconstruction at a cost of $535 million. if the construction company were to keep the highway open for traffic during construction, the highway reconstruction project would take much longer and be more expensive. suppose that construction would take four years if the highway were kept open, at a total cost of $800 million. the state department of transportation had to make its decision in 2014, one year before the start of construction (so that the first payment was one year away). so the department of transportation had the following choices: (i) close the highway during construction, at an annual cost of $267.5 million per year for two years. (ii) keep the highway open during construction, at an annual cost of $200 million per year for four years. now suppose the interest rate is 80%. calculate the present value of the costs incurred under each plan.

In ledland, unemployed adults receive government assistance. to reduce unemployment, the government proposes to supplement the income of those who accept jobs that pay less than government assistance, thus enabling employers to hire workers cheaply. however, the supplement will not raise any worker's income above what government assistance would provide if he or she were not gainfully employed. therefore, unemployed people will have no financial incentive to accept jobs that would entitle them to the supplement.which of the following, if true about ledland, most seriously weakens the argument of the editorial? (a) the government collects no taxes on assistance it provides to unemployed individuals and their families.(b) neighboring countries with laws that mandate the minimum wage an employer must pay an employee have higher unemployment rates than ledland currently has.(c) people who are employed and look for a new job tend to get higher-paying jobs than job seekers who are unemployed.(d) the yearly amount unemployed people receive from government assistance is less than the yearly income that the government defines as the poverty level.(e) people sometimes accept jobs that pay relatively little simply because they enjoy the work.