The linear correlations between violent crime rate and perce

The linear correlations between violent crime rate and percentage of the population that has a cell phone is -0.98 for years since 1995. Do you believe that increasing the percentage of the population that has cell phone decrease the violent crime rate? a) yes b) no What might be a lurking variable between percentage of the population with a cell phone and violent crime rate? a) the average cell phone\'s effectiveness as a weapon b) the police c) the economy d) overall cell phone signal strength

Solution

The sign and the absolute value of a correlation coefficient describe the direction and the magnitude of the relationship between two variables.

from above data it is clear that increasing the percentage of the population that has cell phone decrease the violent crime rate

lurking variable between percentage of the population with a cell phone and violent crime rate is the police