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.
The drum set is the instrument central to the rhythm section. It acts as the motor that drives the group. A drum set can contain a multitude of percussion instruments, but in jazz it usually consists of only a few parts. The lowest drum, or bass drum, is played with a pedal. The hi-hat, also played with a pedal, is a duo of small cymbals that crash together. They are used for crisp accents.