What is the name of the violet colored powder that was developed by the US Naval Research Laboratory (NRL) and is used on Class B and Class C fires?
a. Sodium bicarbonate
b. Potassium bicarbonate
c. Monoammonium phosphate
d. Dry powder
b
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Poor resolution is caused by unacceptable levels of
a. density. b. umbra. c. penumbra. d. contrast.
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The degree to which a measurement or an estimate based on measurements represents the true value of the attribute that is being measured is referred to as ____.
A. p-value B. precision C. validity D. accuracy
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