Puppies Windows Theme will help you customize your desktop with wallpapers of cute puppies. The theme includes 22 high-resolution background images that will fit any screen type.
In statistics we tend use the 'hat' notation to imply a statistic. We designate P to represent the proportion in the population. Because P is unknown and unknowable we use Phat to designate the proportion in the sample. Suppose 30 out of 100 people in my sample support Trump. P = unknown and unknowable.
RULES OF THUMB: 1) Use the recipe for the standard deviation of p hat only when the population is at least 10 times as large as the sample. 2) Use the normal approximation to the sampling distribution of p hat for values of n and p that satisfy np > 10 and n(1-p) > 10.