# QRB 501 Final Exam 6

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**QRB 501 Final Exam**

1). Write the following as an algebraic expression using X as the variable. A number decreased by 25 and multiplied by 4

2). Write the following as an algebraic expression using X as the variable: Five more than the product of 7 and a number

3). Write the following as an algebraic expression using X as the variable: A number subtracted from -7

4). Solve 4(3^2) + 7(3 + 9) - (-6)

5). Solve 3(3^2) – 8(9 - 2)/2

6. Solve - 3 – (-2 + 4) -5

7). Identify the variable, constant and coefficient of expression: -6g + 9

8). Identify the variable, constant and coefficient of the expression: x – y

9). Identify the variable, constant, and coefficient of the expression: 10k – 15

10) Solve the system of equations: 3x – 5y = 7 2x + 3y = 30

11). Solve the system of equations 4x + 3y = 1 3x + 2y = 2

12). Solve the system of equations 3x + y = -7 X – y = -5

13). Which is true about reporting the Consumer Price Index (CPI) ?

14). Which of the following is true of a base period for an index number?

15). Which of the following is true of an index?

16). Why are unequal class intervals sometimes used in a frequency distribution?

17) What happens as the number of classes in a histogram decreases?

18). What is the term for a number of observations in a class in a frequency distribution?

19). What is the slope of the line: 2y+ 8x = 26

20). What is the slope of the line: 3x –y = 6

21). What is the slope of the line: 5y – x = 10

22). Which of the following is observed in a scatter plot when there is an inverse relationship between x and y?

23). Which statement is true of the y-intercept in the linear regression model?

24). Which statement is true of a regression line that is superimposed on the scatter plot?

25). What is the principle balance if the principle plus interest at the end of 1.5 years is $ 3, 360 at an annual interest rate of 8%?

26). Since money has the ability to earn interest, its value increases with time. What affects the future of an investment more, the interest rate or the time the investment is held?

27). When the interest rate is positive, what happens to the value of money as we move from the future to the presents?

31). For which measure of central tendency will the sum of the deviations always be zero ?

32). What is the relationship among the mean, median, and mode in a symmetric distribution?

33). Which measure of dispersion represents variation from the mean?

34). Which of the following is true in a normal distribution?

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