By Stan Gibilisco — McGraw-Hill Professional

Updated on Sep 12, 2011

Review the following concepts if necessary:

- Math Sets Help
- Relations and Functions Help
- Math Numbers Help
- One-Variable Equations Help
- Simple Graphs Help
- Tweaks, Trends, and Correlation Help

**Background Math Practice Test **

A good score is 8 correct.

- What is the square of
*x*/(–5), where*x*represents any real number? *x*^{2}/5*x*^{2}/25- –
*x*^{2}/5 - –
*x*^{2}/25 - In the Venn diagram of Fig. 1-20, what does the shaded region represent?
*A*+*B**A**B**A**B**A**B*

- In Fig. 1-20, the objects labeled
*P*,*Q*, and*R*represent individual points. Which of the following statements is true?*P*(*A**B*)*Q*(*A**B*)*R**P**A*

- When we write 23.723723723723 . . ., we are writing a representation of
- an irrational number
- a nonterminating, nonrepeating decimal
- a nondenumerable number
- a rational number

- Suppose a graph is drawn showing temperature in degrees Celsius (°C) as a function of time for a 24-hour day. The temperature measurements are accurate to within 0.1°C, and the readings are taken every 15 minutes. The day's highest temperature is +18.2°C at 4:45 P.M. The day's lowest temperature is +11.6°C at 5:00 A.M. A reasonable range for the temperature scale in this graph is
- 0.0°C to +100.0°C
- –100.0°C to +100.0°C
- +10.0°C to +20.0°C
- +10.0° C to +50.0°C

- In a constant function:
- the value of the dependent variable constantly increases as the value of the independent variable increases
- the value of the dependent variable constantly decreases as the value of the independent variable increases
- the value of the independent variable does not change
- the value of the dependent variable does not change

- It is reasonable to suppose that the number of lightning strikes per year in a 10,000-square mile region is positively correlated with
- the number of people in the region
- the number of stormy days per year in the region
- the number of cars on the region's highways
- the average altitude of the region above sea level

- Suppose a large image file is downloaded from the Internet. The speed of the data, in bits per second (bps), is plotted as a function of time in seconds. In this situation, data speed is considered
- the dependent variable
- the independent variable
- a constant function
- nondecreasing

- Suppose the path of a hurricane's center is plotted as a set of points on a map at 12-hour intervals, with the latitude and longitude lines as graphic coordinates. A continuous plot of the path of the storm center can be approximated using
- interpolation
- extrapolation
- curve fitting
- correlation

- Which of the following statements is false?
- All relations are constant functions.
- All constant functions are relations.
- The values in a bar graph do not always add up to 100%.
- Zero correlation is indicated by widely scattered points on a graph.

(The square of a number is equal to the number multiplied by itself.)

**Fig. 1-20.** Illustration for Practice Test Questions 2 and 3.

**Answers**

- b
- b
- b
- d
- c
- d
- b
- a
- c
- a

From Statistics Demystified: A Self-Teaching Guide. Copyright © 2004 by The McGraw-Hill Companies. All Rights Reserved.

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