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.
Bass drums can have a variety of strikers depending on the music: 1  A single heavy felt covered mallet (Fr. 2  When the drum is mounted vertically, the mallet above may be held in one hand and a rute held in the other. 3  2 matching bass drum mallets or a double headed mallet are used for playing drum rolls. When used as part of a drum kit, a variation of the mallet described above is mounted on a pedal and called a beater.