Five specimens of untreated wastewater produced at a gas field had an average benzene concentration of 6.83 mg/L with a standard deviation of 1.72 mg/L. Seven specimens of treated wastewater had an average benzene concentration of 3.32 mg/L with a standard deviation of 1.17 mg/L. Find a 95% confidence interval for the reduction in benzene concentration after treatment.
What will be an ideal response?
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A(n) ____________________ relationship is where the location deviation of the centerplane of a feature of size is being defined relative to a datum centerplane.
Fill in the blank(s) with the appropriate word(s).
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Wattmeters read true power in a circuit. This can be expressed by what equation?
A) Power = ohms × volts × power factor B) Power = amps × volts C) Power = amps × voltage × power factor D) Power = ohms divided by volts
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Which of these methods used to determine which component in a circuit is not working properly?
A) Voltage test B) Hopscotching C) Amp draw test D) Ohm test
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Find the signal energy of each of these signals.
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