http://www.friscothunderifl.com/statistics-television-viewers/
statistics television viewers
Statistics problem? Help?
It says suppose 20% of all television viewers in the country watch a particular program. For a random sample of 2500 households mesasured by a rating agency, describe the frequency curve for the possible sample proportions who watch the program.
I looked up the answer in the back and it says that it is a bell shaped curve with a standard deviation of .008 but i don’t understand how they found that standard deviation? Help!! i have a quiz 
The standard deviation for the number of households found to watch the program is sqrt(2500 x .2 x .8) = 20, from the formula for the s.d. of a binomial distribution.
20/2500 = .008 would be the standard deviation of the percentage of people watching the program.
I guess that’s right; although I’m an actuary, I’m not really that strong in statistics. Hopefully a stat expert will confirm this or explain it further.
