:1a. Consider the simple random sample of 100 tickets drawn
from the box of 10,000 tickets referred to in the previous
example.  It turns out that 20 of the 100 tickets in the sample
are marked with a 4.  The lower endpoint for an approximate 99.7%
confidence interval for the percentage of tickets which are
marked with a 4 is closest to 
 a.   8%
 b.  12%
 c.  16%
 d.  18%
 e.  19%