From 1969 to 2001, the number of household vehicles in the United States has ____.

A. stayed the same
B. doubled
C. nearly tripled
D. more than quadrupled


Answer: C

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The current flow in a(n) ____ circuit must be the same at any point in the circuit.

a. parallel b. combination c. alternating d. series

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A discrete variable X can take on integer values of 1 to 10. A sample of size 50 results in the follow­ing probability estimates:


(a) Write out and graph the cumulative distribution.
(b) Calculate the following probabilities using the cumulative distribution: (1) X is between 6 and 10, and (2) X takes the value 4, 5, or 6.
(c) Use the cumulative distribution to show that P(X = 7 or 8) = 0.0. Even though this prob­ability is zero, the statement about X is that it can take on integer values of 1 to 10. How do you explain the apparent contradiction in these two statements?

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Which one of the five values shown on an NFRC window label indicates the rate at which heat move through the material?

A) Solar Heat Gain Coefficient B) R-value C) Visible Transmittance D) U-factor rating

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A(n) ____ circuit has infinite resistance because no current flows through it.

A. open B. closed C. short D. complete

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