Other's On-Line Resources (Chapter 5)

 

Creating a Simple Random Sample
  • Description:
    In this interactive on-line resource, you get to specify (a) the size of the population from which your sample will be drawn, (b) the size of the sample you want, and (c) whether or not there will be "sampling with replacement." Then you'll be given the ID numbers for the n items randomly selected from the larger set of N items.

  • What to Do:
    1. Click on the colored title of this on-line resource,"Creating a Simple Random Sample."
    2. In the boxes that say "This set is from __ to __," change the first number to 1 and then change the second number to the size of your group (i.e., to the numerical value of N).
    3. Type in your desired sample size where it says "You are choosing a set of size __."
    4. Choose either "Allow Repeats" or "Don't Allow Repeats" depending on whether you want to sample WITH replacement or sample WITHOUT replacement, respectively.
    5. Click on the "GO!" button and then look at the n numbers that appear. These numbers are the ID numbers for the items randomly selected to be in your sample.

  • Sky Huck's Puzzle Question:
    What do you think will happen if you make n larger than N and then sample without replacement? After making your guess, say (1) "This set is from 1 to 10," (2) "Your are choosing a set of size 11," and (3) "Don't Allow Repeats." Then click "GO!" and look to see if your prediction was right or wrong?
     
Political Polls
  • Description:
    In this interactive on-line resource, you'll play a little game in which you assume the role of a researcher who's been hired as a statistical consultant for a politician. The politician, of course, wants you to conduct a poll. Your job is to determine what kinds of people to sample. After you make your sampling decisions, you'll get to see how good your polling results are.

  • What to Do:
    1. Click on the colored title of this on-line resource,"Political Polls."
    2. Read the information on the first screen, and then click on the trianglular picture that says"Sampling the Electorate."
    3. Read the information on the next screen, and be sure to click on the 2 "clickables" directly under the question, "Are you ready to go to work?"
    4. Make your polling decisions, and then click on the button: "Poll a Sample of the Population." The next screen will automatically pop up telling you how well you did.

  • Sky Huck's Puzzle Question:
    If you play this little game again (by first clicking on the "Clear Selections" button and then making new choices), what's the best SINGLE demographic category to select? What's the SINGLE worst category to select? And how can you determine whether your answers to these 2 questions are correct?
     

Copyright © 2012

Schuyler W. Huck
All rights reserved.

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