A journalist believes that it is possible to predict the number of Winter Olympic medals a country will win by analyzing the country's gross domestic product (GDP) per capita in the year prior to the Olympics. The journalist collects data on the 26 countries that won medals at the 2010 Winter Olympics, performs a regression analysis, and obtains the following regression equation: Olympic Medals Won in 2010 = 3.25 + 0.22(GDP per capita in 2009, in thousands of dollars)

Required:
What should be true about the GDP of the country?

Areal estate agent is considering changing her cell phone plan. there are three plans to choose from, all of which involve a monthly service charge of $20. plan a has a cost of $.42 a minute for daytime calls and $.17 a minute for evening calls. plan b has a charge of $.52 a minute for daytime calls and $.15 a minute for evening calls. plan c has a flat rate of $80 with 275 minutes of calls allowed per month and a charge of $.38 per minute beyond that, day or evening.a. determine the total charge under each plan for this case: 150 minutes of day calls and 70 minutes of evening calls in a month. (do not round intermediate calculations. round your answer to 2 decimal places. omit the "$" sign in your response.)c. if the agent will use the service for daytime calls, over what range of call minutes will each plan be optimal? (round each answer to the nearest whole number.include the indifference point itself in each answer.)d. suppose that the agent expects both daytime and evening calls. at what point (i.e., percentage of total call minutes used for daytime calls) would she be indifferent between plans a and b?