Which is correct? Random

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Which is correct?

		Random errors affect accuracy and systematic errors affect precision.
		An accurate result shows agreement with the true or accepted value.
		Precise results can contain significant random error, but little systematic error.
		The standard deviation is a good measure of accuracy.

Polydimethylsiloxane (PDMS) stationary phases have low polarities. Which of the following statements is TRUE about gas chromatography using PDMS stationary phases?

		The gas chromatography column is typically packed with silica microparticles.
		An oven is used to control the column temperature because a constant temperature is always needed in gas chromatography
		Octane (C₈H₁₈, boiling point: 126 ºC) is eluted later than dodecane (C₁₂H₂₆, boiling point: 216 ºC)
		3-Pentanone ((C₂H₅)₂CO, boiling point: 102 ºC) is eluted later than propanol (CH₃CH₂CH₂OH, boiling point: 97 ºC)

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