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.
In a drum kit, the bass drum is much smaller than in the traditional orchestral use, most commonly 20 or 22 inches (51 or 56 cm) in diameter. Sizes range from 16 to 28 inches (41 to 71 cm) in diameter while depths range for 12 to 22 inches (30 to 56 cm), with 14 to 18 in (36 to 46 cm) being normal.