A statistical sample is:
a. a group of members of a population selected to represent that population.
b. a characteristic of a sample
c. a branch of mathematics designed to draw conclusions from data that has been collected, organized, and subjected to analysis.
d. an observable characteristic of a phenomenon that can be measured or classified.
Answer: A
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The transmission power is 40 W, under a free-space propagation model,
(a) What is the transmission power in unit of dBm? (b) The receiver is in a distance of 1000 m; what is the received power, assuming that the carrier frequency fc = 900 MHz and Gt = Gr = 1 dB? (c) Express the free space path loss in dB.
A piston and rod assembly has a rotating weight of 129 grams and a reciprocating weight of 380 grams. Calculate the bobweight used to balance the crankshaft
A) 129 g B) 380 g C) 319 g D) 509 g
Coil polarity is determined by the ________
A) Turn ratio B) Saturation direction C) Direction of rotation of the coil windings D) Direction of laminations
As a general rule for stable flip-flop triggering, the clock pulse rise and fall times must be:
A) very short. B) at a maximum value to enable the input control signals to stabilize. C) of no consequence as long as the levels are within the determinate range of values. D) very long.