Question: A security feature on some web pages is graphic representations of words that are readable by human beings but not machines. When a certain design format was tested on 450 subjects, by having them attempt to read ten disguised words, 448 subjects could read all the words.
a. Give a point estimate of the proportion p of all people who could read words disguised in this way.
b. Show that the sample is not sufficiently large to construct a confidence interval for the proportion of all people who could read words disguised in this way.