handout day3

Probability and Statistics for Engineering and the Sciences (with Student Suite Online)

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Winter, 2008 Thursday, Jan. 10 Stat 321 – Lecture 3 Descriptive Statistics cont. (Ch. 1) Numerical Summaries: Spread Range = max - min Fourth spread = f s = upper fourth – lower fourth, width of middle 50% of observations Standard deviation = 1 ) ( 2 - - = n x x s i , roughly “average deviation from mean” Example 1: Consider the following six histograms of (hypothetical) quiz scores in six classes (scores are integers ranging from 1 to 9): (a) Predict: Which has the least variability? A B C Which has the most variability? A B C Which has more variability? C D Which has more variability? D E Does class F has a lot or a small amount of variability compared to the other classes?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Winter, 2008 Thursday, Jan. 10 (b) Determine the fourth spread of the quiz scores for each class by hand. Based on these calculations, do you need to revise any of your predictions? Class A Class B Class C Class D Class E Class F f L f U f s = f U - f L Based on these calculations, do you need to re-think any of your answers above? Explain. (c) You will be told the standard deviation of quiz scores for each class. Class A
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 6

handout day3 - Winter, 2008 Thursday, Jan. 10 Stat 321 –...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online