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.
A chromatic set of tuned cowbells. A pitched percussion instrument is a percussion instrument used to produce musical notes of one or more pitches, as opposed to an unpitched percussion instrument which is used to produce sounds of indefinite pitch.The term pitched percussion is now preferred to the traditional term tuned percussion : Many untuned percussion instruments, such as the snare drum, are tuned by the player, but this tuning does not relate to a particular pitch. 2  Untuned percussion instruments can and frequently do make sounds that could be used as pitched notes in an appropriate context.