Consider the following examples of two different types of statistical investigations. Example 1 Radio rating services sometimes collect data on listenership by asking participants to record the date, time, and station each time they listen to the radio.
Popular types of invisible braces include ceramic brackets, inside braces and clear aligners. Ceramic braces are just like metal braces, except that they use tooth-colored brackets (and sometimes tooth-colored wires) rather than metal to straighten teeth.
Today's braces are very high-tech appliances. Over time, braces align and straighten your teeth. Here's how they do it: Braces have three basic parts: 1  Brackets made of metal or ceramic. 2  A bracket is attached to each tooth. 3  Bonding material (glue) or a metal band. 4  This is what attaches the bracket to the tooth. 5  An arch wire, which is a thin metal wire that runs from bracket to bracket and puts pressure on the teeth.