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.
Chimes, bells, and xylophone are examples of fixed-pitch percussion instruments. These instruments have a definite pitch, but the pitch cannot be tuned or changed by the player. Usually, fixed-pitch percussion instruments are arranged in sets, similar to the layout of a piano keyboard.here are three basic types of percussion instruments. Instruments such as the snare drum and cymbal are of indefinite pitch. The sound they produce has no specific pitch and works with any harmony or key that the band might be playing.