1 The level of significant difference you are hoping to show (e.g. p p value takes more study power. 2  The frequency of the outcome in the two groups. 3  Imagine an exposure that increases incidence by a third: it is easier to show a difference between 30 and 45 percent than between 10 and 15 per cent.
Name of Instrument: Bass drum. Family: Percussion. How to Play: The bass drum is played by using padded beaters or sticks and striking it against the drumhead. In a drum set, the musician plays the bass drum by using a pedal-operated stick. Types: The bass drums that are used in marching bands and military music have two drumheads.
Double bass. For the contrabass voice, see basso profondo; for the frequency range in general, see sub-bass. For the album by Niels-Henning Ãrsted Pedersen and Sam Jones, see Double Bass (album). For other instruments, see double bass drum, acoustic bass guitar or contrabass violin. The double bass, or simply the bass (and numerous other names), is the largest and lowest-pitched bowed string instrument in the modern symphony orchestra.