Approaches that can minimize biases in the design of a clinical trial are: question 5 options:
a. clearly define risk and outcome, with objective and preferably validated methods
b. standardize and blind data collection
c. select patients using rigorous criteria
d. all of the above

Upscale hotels in the united states recently cut their prices by 20 percent in an effort to bolster dwindling occupancy rates among business travelers. a survey performed by a major research organization indicated that businesses are wary of current economic conditions and are now resorting to electronic media, such as the internet and the telephone, to transact business. assume a company's budget permits it to spend $5,000 per month on either business travel or electronic media to transact business. graphically illustrate how a 20 percent decline in the price of business travel would impact this company's budget set if the price of business travel was initially $1,000 per trip and the price of electronic media was $500 per hour. suppose that, after the price of business travel drops, the company issues a report indicating that its marginal rate of substitution between electronic media and business travel is 1. is the company allocating resources efficiently? explain.

Atax on the sellers of coffee will a. increase the price of coffee paid by buyers, increase the effective price of coffee received by sellers, and increase the equilibrium quantity of coffee. b. increase the price of coffee paid by buyers, increase the e ffective price of coffee received by sellers, and decrease the equilibrium quantity of coffee. c. increase the price of coffee paid by buyers, decrease the effective price of coffee received by sellers, and increase the equilibrium quantity of coffee. d. increa se the price of coffee paid by buyers, decrease the effective price of coffee received by sellers, and decrease the equilibrium quantity of coffee.

When the national economy goes from bad to better, market research shows changes in the sales at various types of restaurants. projected 2011 sales at quick-service restaurants are $164.8 billion, which was 3% better than in 2010. projected 2011 sales at full-service restaurants are $184.2 billion, which was 1.2% better than in 2010. how will the dollar growth in quick-service restaurants sales compared to the dollar growth for full-service places?