16-1 

a. American children between 8 and 18

b. Variable: TV?  Categorical.  (Cat 1: TV; Cat 2: No TV)

c. 68% is a statistic, property of the sample.  p-hat

d. Generally: Access to various forms of media
   Percentage of American children between 8 and 18 who have a TV
   Symbol is pi

e. It does not tell us pi.  We did not survey the millions of children
   in America.

f. It should be a good approximation, since there was a random sample.
   And a fairly large sample.

g. Use p-hat (.68) instead of pi (unknown)because we think it's a
   good approximation.  It's also the only thing we seem to have available.

h. Calculate standard error: .01
   sqrt(.68*(1-.68)/2032)a

i. Goal: Compute the interval (.68-2*.01,.68+2*.01)
   pi might be in this interval