The data set smoke. dta contains information on smoking behavior and other variables for a random sample of single adults from the united states. the variable cigs is the (average) number of cigarettes smoked per day. do you think cigs has a normal distribution in the u. s. adult population? explain.

Graph a triangle (xyz) and reflect it over the line y=x to create triangle x’y’z’. describe the transformation using words. draw a line segment from point x to the reflecting line, and then draw a line segment from point x’ to the reflecting line. what do you notice about the two line segments you drew? do you think you would see the same characteristics if you drew the line segment connecting y with the reflecting line and then y’ with the reflecting line? how do you know?