Day 6: STA205 - Introduction to Statistical Methods

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• Announcements:
  • Reminder: stash your rectangles.

  • Your quiz is returned. Some comments:
    1. Several things:
       • $z=0.13$ gives the closest area to 0.5500. (Don't commit "equality abuse": some of you wrote ".55=0.13" or the like -- don't do that!)
       • Don't forget your units: talk about inches.
       • State your conclusion as a sentence.

    2. Review:
       1. Statistics is the science of reasoning from data (usually inferring something about the population from which the data was collected).
       2. Data is a collection of variables obtained from a set of observational units.
       3. Population is the entire set of observational units under study, and from which the sample data is obtained.

  • How's the IMath going? How's the Statcrunch going?
    • Load the Stop and Frisk Data for packet 2. Load it by "WWW address", and make sure to set the delimiter to "comma" (because this is a "csv" (comma-separated values) file.
    • Once the data is loaded, click on "Graph".
    • Alternatively, if you want you can join my "group" on Statcrunch. That way you can access the data more quickly. It's Sta205-Long, if you want to add yourself into that group.

  • Today: we'll start with any questions about Packet 2: Summarizing Categorical Data

  • After that, we'll start Packet 3: Sampling Distribution of the Sample Proportion
    • If you don't have your Packet, just take out some paper and make notes that you can use to transfer to your packet when you DO get it printed out.

• Links:
  • Stop and Frisk Data for packet 2.
  • The Standard Normal Table of probabilities.