Learner Express Learner Express is a gallery of short video modules distilled from over 350 hours in the Annenberg Learner Collection. The science topics are useful in a STEM-based curriculum, while the math topics align with the Common Core Standards. You can quickly locate 1-5 minute videos to enhance classroom or professional learning. Indexed, annotated, and linked to related resources, Learner Express embodies the best of just-in-time learning.
How many people
should you survey for accurate polling results?
You have switched political camps once again and
are back working as a pollster for Stephanie Higgins.
It's the end of the campaign and Higgins knows that
what she says and does will make or break her. It's
your job to stay on top of what the voters are thinking
about each of the candidates.
It would be great if you could poll all of the
voters in the city, but there is no time for that.
Instead, you have to decide how many voters to poll
in order to get a result that you can be confident
about. You will ask them this question: