Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

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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.

Poll a group of voters several times. Will the results always be the same?

Webster Fletcher has been very impressed with your work for Stephanie Higgins -- so impressed, in fact, that he has stolen you away from Higgins. You have now taken a job as Fletcher's chief pollster.

It's midway through the campaign and Fletcher is concerned about how female Republicans are planning to vote. Fletcher, having been in politics for quite a while, knows that polls assume that voters in the same demographic group will all vote the same way. He also knows that is not always true.

To provide Fletcher with a look at the data he needs, you are going to conduct three telephone polls of Republican women in the city. Each time, you will call a different group of these women and ask them:

"Who will you vote for in the mayoral election?"

Are you Ready to Go to Work?

1. Read Webster Fletcher's political profile

2. View the demographic profile of the city

3. Conduct your first telephone poll. To select a random sample, you need to choose a increment to base your sample on. Whom would you like to call?

Every 3rd person
Every 5th person
Every 9th person
Every 15th person

[Back to What is a Margin of Error?]

"Statistics" is inspired by programs from Against All Odds: Inside Statistics,
a video series in the
Annenberg Media Multimedia Collection.

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