1. 4.2C Completely Randomized Design
AP Statistics
4.2C Completely Randomized Design

2. Opener
Evan wanted to conduct an experiment using the students in his AP Statistics class. He decided to randomly assign students to treatment groups based on their height in centimeters. The first 20 students whose heights rounded to an even number of centimeters received treatment 1 and the remaining 20 students received treatment 2.

3. Opener
Did Evan design a completely randomized experiment? Explain.

4. Statistical Significance
What are the chances that the researchers got a result of 12 drivers distracted by cellphones NOT stopping at the rest stop?
(There are 156 data points on the graph)

5. Completely Randomized Design
Group 1
½ subjects
Treatment 1
Random assignment
Compare Results
Subjects
Group 2
½ subjects
Treatment 2
Include a brief description of your experimental design:
how treatments are assigned to experimental units (describe your randomization process)
specifically state what you will compare at the end of the experiment.

6. Skydiving, Anyone?
A piece published in the British Medical Journal notes (“Parachute use to prevent death and major trauma related to gravitational challenge: systematic review of randomized control trials,” Gordan, Smith, and Pell, BMJ, 2003:327) that we can’t tell for sure whether parachutes are safe and effective because there has never been a properly randomized, double-blind, placebo-controlled study of parachute effectiveness in sky diving. (Um, this was a humor piece…) Design a completely randomized experiment to test parachute effectiveness.

7. Homework
4.2D HW: Blocking and Matched Pairs Design

8. Gummy Bears in Space LAB Write-Up
Due Friday, September 18, 2:45 pm.
Shared via GoogleDocs—no paper copies accepted.
Must be typed. (take a photo of any graphs you can’t create on the computer and insert them into your document).
File naming convention:
APSyourperiod_GummyBearsInSpace_FirstnameLastinitial
Guidelines are available at danicicmath.com (ignore the part about submitting through It’s Learning…we’re not ready for that yet).