8/31/2016

Questions about RStudio

Methods of Collecting Data

• Census
• Sample
• Experiment
• Observational Study
• Anecdotal Evidence

The Idea Behind Sampling

• parameters versus statistics

Random Rectangles Activity - see handout

• Open R script p:\data\math\hartlaub\Elements of Statistics\RandomRectangle.R
• Where is the distribution of guesses centered?
• Where is the distribution of your judgement samples of 5 rectangles centered?
• Where is the distribution of the simple random samples of 5 rectangles centered?
• Where is the distbituion of the simple random samples of 10 rectangles centered?
• Use the R commands in RandomRectangle.R to investigate what happens when the sample size increases from 5 or 10 to 20 and 40.

The Importance of Randomization

Different types of Bias

Sampling Activity - Samples, Surveys, and Polls - see handout

Please read Sections 1.5 and 1.6 for class on Friday