Everyone must wear medical grade gloves in a sterile field. A sterile field is usually used during surgery. A sterile syringe and vial of medication. Surgical hand scrubs remove most bacteria from the skin before gloves are put on.
Standard score. In statistics, the standard score is the signed number of standard deviations by which the value of an observation or data point is above the mean value of what is being observed or measured. Observed values above the mean have positive standard scores, while values below the mean have negative standard scores. The standard score is a dimensionless quantity obtained by subtracting the population mean from an individual raw score and then dividing the difference by the population standard deviation.
The maximum possible raw score varies by section (and depends on the total number of questions asked). For example, for the Critical Reading, there are 67 questions, so the maximum raw score is 67. If you answered all 67 questions correctly, you would have a raw score of 67. For Math, there are 54 questions.