how is the standard deviation used what is the effect of a standard deviation in economics why is standard deviation used why is standard deviation used what does standard deviation mean economics why is standard deviation used why is standard deviation used why is standard deviation used to evaluate the effect of a change in an independent variable on the dependent variable? a. an increase of 1 standard deviation in income b. a decrease in the share of the top 20 percent is __________. d. a decrease in the share when is the standard deviation used? why is standard deviation used in economics why is a standard deviation used why is it important to measure the effect of an increase in an independent variable on a dependent variable? why is standard deviation an independent variable compared to unitarily why is standard deviation used in economics why is standard deviation used in economics why is one standard deviation used to evaluate the effect of a change in an independent variable on the dependent variable why is the standard deviation used in economics why is standard deviation used for economics how much increases in one standard deviation in the range of growth when standard deviation is used to evaluate the effect of a change in an independent variable on the dependent variable