Salary Information for a COA. According to PayScale.com, as of October 2014, the average hourly wage for most certified orthodontic assistants (COAs) was between $11.75 and $22.17, with a median hourly income of $17.his is slightly higher than for the majority of non-certified dental assistants, whose hourly wages ran from $9.74 to $18.21 at the same time period. An associate's degree in dental assisting is required for a career as an orthodontic assistant.
quart. n. 1. (Units) a unit of liquid measure equal to a quarter of a gallon or two pints. 1 US quart (0.946 litre) is equal to 0.8326 UK quart. 1 UK quart (1.136 litres) is equal to 1.2009 US quarts. 2. (Units) a unit of dry measure equal to 2 pints or one eighth of a peck.
Quartiles divide a rank-ordered data set into four equal parts. The values that divide each part are called the first, second, and third quartiles; and they are denoted by Q1, Q2, and Q3, respectively. Note the relationship between quartiles and percentiles. Q1 corresponds to P25, Q2 corresponds to P50, Q3 corresponds to P75. Q2 is the median value in the set.