Name:    Chapter 2 Appendix Practice

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

1.

When a relevant variable that is not named on either axis changes,
 a. there will be a movement along the curve. b. the curve may or may not change. It depends on how the variables are related. c. the curve will be unaffected since only the variables on the axis affect the curve. d. the curve will shift.

2.

The x-coordinate is the
 a. first number of an ordered pair and represents the point's horizontal location. b. second number of an ordered pair and represents the point's horizontal location. c. first number of an ordered pair and represents the point's vertical location. d. second number of an ordered pair and represents the point's vertical location.

Figure 2-10

3.

Refer to Figure 2-10. The movement from point B to point C is a
 a. shift of the curve. b. change in price. c. movement along the curve. d. change in costs to the firm.

4.

Refer to Figure 2-10. The price of roses and the quantity of roses are
 a. directly related and therefore move in the same direction. b. directly related and therefore move in opposite directions. c. inversely related and therefore move in opposite directions. d. independent of each other.

5.

Refer to Figure 2-10. The slope of the curve between points A and B is
 a. 5/2 b. 2/5 c. -2/5 d. -5/2

6.

Refer to Figure 2-10. The movement from point A to point B is a
 a. shift of the curve. b. change in preferences. c. movement along the curve. d. All of the above are correct.

7.

In order to provide information on two variables, an economist must use
 a. a bar graph. b. pie chart. c. the coordinate system. d. a time-series graph.

Figure 2-9

8.

Refer to Figure 2-9. The correct designation of point A is:
 a. (6, 0) b. (0, 24) c. (6, 24) d. (24, 6)

9.

Refer to Figure 2-9. What would you say about the relationship between coffee and hours without sleep?
 a. The less coffee a person drinks per day, the more time he can go without sleep. b. There is no relationship between how much coffee per day a person drinks and how long they can go without sleep. c. The more coffee a person drinks per day, the longer he can go without sleep. d. The relationship between cups of coffee per day and time without sleep is too unpredictable to consider.

10.

Refer to Figure 2-9. Cups of coffee per day and the hours that someone can go without sleep have
 a. a positive correlation. b. a negative correlation. c. a random correlation. d. no correlation.

11.

Which of the following is NOT a problem associated with graphing in economics?
 a. omitted variables b. holding everything else constant c. reverse causality d. the ability to show a relationship between 2 variables

12.

In a pie chart, each "slice" of the pie represents
 a. a specific percentage of the total pie. b. an equal share of the total pie. c. the amount of the pie each of the two variables represents. d. one-half of the total pie.

13.

The slope of a straight line is calculated by
 a. rise divided by run. b. run divided by rise. c. the average of rise and run. d. rise plus run.

14.

Graphs such as bar graphs are limited in that they
 a. can only show variables that are positively related. b. are extremely difficult to understand. c. provide information for only a single variable. d. provide information on no more than 2 variables.

15.

A type of graph that can be used to display the relationship between two variables is
 a. a pie chart. b. a bar graph. c. a time-series graph. d. the coordinate system.

16.

A coordinate system is used to
 a. show the flow of income and products in an economic system. b. organize labor and other resources in the production process. c. allow economists to show two variables on a single graph. d. teach economists how to draw graphs consistently.

17.

The slope of a line is calculated by
 a. change in x/change in y. b. change in y/change in x. c. x/y. d. x + y.

18.

The slope of a fairly flat upward-sloping line will be a
 a. small positive number. b. large positive number. c. small negative number. d. large negative number.

19.

The y-coordinate is the
 a. first number of an ordered pair and represents the point's horizontal location. b. second number of an ordered pair and represents the point's horizontal location. c. first number of an ordered pair and represents the point's vertical location. d. second number of an ordered pair and represents the point's vertical location.

20.

The ordered pair that represents the origin on a graph is
 a. (1, 1). b. (0, 0). c. (0, 1). d. (1, 0).

21.

Which of the following statements about slope is NOT correct?
 a. Slope explains how much one variable responds to changes in another variable. b. Slope can be computed by delta x/delta y. c. Slope is positive if the 2 variables are moving in the same direction. d. Slope does not change if the line is linear.

22.

When a variable on an axis of a graph changes, the curve
 a. will not shift. b. will shift. c. may or may not change. It depends on how the variables are related. d. will shift if the variable is on the vertical axis, but not on the horizontal axis.

23.

An ordered pair is
 a. the process of checking calculations twice before placing them on a graph. b. two numbers which can be represented by a single point on a graph. c. two numbers that are represented by side-by-side points on a graph. d. two points on a graph which are equal distances from the origin.

24.

Which of the following is a correct statement about slope?
 a. A horizontal line has an infinite slope, and a vertical line has a zero slope. b. A horizontal line has a slope of 1, and a vertical line has a slope of -1. c. A horizontal line has a zero slope, and a vertical line has an infinite slope. d. None of the above are correct.

25.

The point where both x and y are zero is known as the
 a. origin. b. null. c. zero coordinate. d. center.