Flashcards in Chapter 3 True and false graphs Deck (10):
when graphing in the coordinate system, the x-coordinate tells us the horizontal location of the point, while the y-coordinate tells us the vertical location of the point
when a line slopes upward in the coordinate system, the two variables measured on each axis are positively related
price and quantity demand for MOST goods are positively related
false; they are negatively related
if three variables are related, one of them must be held constant when graphing the other two in the coordinate system
if 3 variables are related, a change in the variable not represented on the coordinate system will cause a movement along the curve drawn in the coordinate system.
false; they change in a variable not represented on the graph will. cause a shift in the curve
the slope of a line is equal to the change y dividend by the change in x along the line
when a line has a negative slope, the two variable measured on each axis are positively related
false; negative slope implies a negative relation
there is a positive correlation between lying down and death. if the conclusion from this evidence is that it is unsafe to lie down, then there is an omitted variable problem because critically ill people tend to lie down.
reverse causality means that, while people think a causes b, b may actually cause a