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.
Dental braces are devices that are placed directly on teeth in order to move them. For most of us, braces are the most common method for achieving optimally aligned teeth. Aside from straightening teeth, braces are used to improve the relationship of how our teeth come together between the upper and lower jaws.