Chapter 3 True and false graphs

Question 1

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

Answer 1

true

Question 2

when a line slopes upward in the coordinate system, the two variables measured on each axis are positively related

Answer 2

true

Question 3

price and quantity demand for MOST goods are positively related

Answer 3

false; they are negatively related

Question 4

if three variables are related, one of them must be held constant when graphing the other two in the coordinate system

Answer 4

true

Question 5

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.

Answer 5

false; they change in a variable not represented on the graph will. cause a shift in the curve

Question 6

the slope of a line is equal to the change y dividend by the change in x along the line

Answer 6

true

Question 7

when a line has a negative slope, the two variable measured on each axis are positively related

Answer 7

false; negative slope implies a negative relation

Question 8

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.

Answer 8

true

Question 9

reverse causality means that, while people think a causes b, b may actually cause a

Answer 9

true

Question 10

because people carry umbrellas to work in the morning and it rains later in the afternoon, carrying umbrellas must cause rain.

Answer 10

false; this is an example of reverse causation