1. suppose four colors are there, we did a survey. People (n) choose
different colors (red, green, yellow, blue).
we get the proportion of people who use red as x1/n.
What is the accuracy for this?
2. Imaging now that we know from prior studies that a certain proportion of
users responds to questions randomly. How can we assess this proportion of ”
第一题就是用large sample proportion算一个confidence interval.
第二题让你估计proportion of “random clickers”。问题是都是混在一起做survey的