The linear correlation between violent crime rate and percentage of the population that has a cell phone is minus0.918 for years since 1995. do you believe that increasing the percentage of the population that has a cell phone will decrease the violent crime rate? what might be a lurking variable between percentage of the population with a cell phone and violent crime rate?

How can a poor housing market put home buyers in a financially unstable position? a. changing property values means it’s easier to find homes with low rental costs. b. when the home value decreases, property taxes and insurance costs increase. c. houses are valued lower than their purchase prices, so the home equity decreases. d. home buyers lose all tax benefits and tax incentives when the housing market goes down. e. mortgage payments can increase even though the home value decreases.

Many potential buyers value high-quality used cars at the full-information market price of € p1 and lemons at € p2. a limited number of potential sellers value high-quality cars at € v1 ≤ p1 and lemons at € v2 ≤ p2. everyone is risk neutral. the share of lemons among all the used cars that might be potentially sold is € θ . suppose that the buyers incur a transaction cost of $200 to purchase a car. this transaction cost is the value of their time to find a car. what is the equilibrium? is it possible that no cars are sold

Russell's study compared gpa of those students who volunteered for academic study skills training and those who did not elect to take the training. he found that those who had the training also had higher gpa. with which validity threat should russell be most concerned?