statistics

• Mean – sum of the values in a set divided by number of values
• Median – middle number in a sorted data set
• mode – the most frequently occurring number in a data set
• Standard deviation – measure of how dispersed data is in relation to a mean
• Shift – a sudden change in values; switching to new lot # of reagents or controls may cause this
• Trend – a gradual increase or decrease in values; deterioration of controls/reagents or contamination may cause this
• bruh

  A) 65%

  B) 95%

  C) 99.5%

  
•  12s – one data point is greater than 2 SD from the mean
• 22s – two consecutive data points are greater than 2 SD away
• 13s – one data point is greater than 3 SD away from the mean
• 41s – four consecutive data points are greater than 1 SD away from the mean
• 10x – ten consecutive data points fall to one side of the mean
• R4s – there are more than 4 SD between two consecutive data points
• coefficient of variation - used to compare variation of distributions with different units relative to their means; ratio of SD over mean times 100