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.
And braces have only been around for a little more than 50 years. They are relatively a new discovery and the types of braces have really exploded in recent years. In fact braces have gone from the metal attachments all the way up to the newest type of braces in which you can remove them each night; Invisalign braces. Really the idea of braces has evolved from big apparatusâ like head gear all the way to those which are hidden behind the teeth.