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econ101_mathrev_sol - METU Department of Economics Econ 101...

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1 METU Department of Economics Econ 101: Introduction to Economics I Section 01-02-03 Fall 2010 Mathematics Review Figure 1 1) According to Figure 1, which line(s) show(s) a positive relationship between x and y ? a) A only b) Both A and D c) A, B. and D d) Both C and E 2) In Figure 1, which line(s) show(s) a negative relationship between x and y ? a) A only b) Both A and D c) A, B, and D d) Both C and E 3) In Figure 1, which line(s) show(s) a positive intercept? a) A and D only b) B and C only c) A, D, and E d) A, D, and B 4) According to Figure 1, which line(s) show(s) a negative intercept? a) C only b) Both C and E c) B, C, and E d) Both B and C
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5) If we say that two variables are directly related, this means that: a) the relationship between the two is purely random. b) an increase in one variable is associated with a decrease in the other variable. c) an increase in one variable is associated with an increase in the other variable. d) the graph has a negative slope. 6) If we say that two variables are inversely related, this means that: a) the graph has a positive slope. b) an increase in one variable is associated with a decrease in the other. c) an increase in one variable is associated with an increase in the other. d) the resulting relationship can be portrayed by a straight line parallel to the horizontal axis. 7) If a positive relationship exists between x and y : a) an increase in x will cause y to decrease. b) a decrease in x will cause y to increase. c) the relationship will graph as an upsloping line. d) the vertical intercept must be positive. Figure 2 8) According to Figure 2, the amount of Y is directly related to the amount of X in: a) both 1 and 3. b) Both 1 and 2 c) 2 only d) 1 only 9) According to Figure 2, the amount of Y is inversely related to the amount of X in: a) 2 only. b)
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