Answer to Question #105693 in Statistics and Probability for suresh

Question

Poll results may differ from the Election outcome due to

A> The sample considered being random
B> A biased organization conducting the poll
C> A good voter turnout
D> All of the above A, B and C
E> None of the above A, B and C

Answer 1

Poll results may differ from election outcome due to A) The sample considered being random.

We have a sample. We calculate a point estimate of a population proportion.Then we build a confidence interval. If sample size $n$ increases the margin of error decreases and we get a narrower interval in which population proportion lies with a confidence level.