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# Class Notes for Statistics at University of Lethbridge

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##### September 27.docx

September 27, 2013 Chapter 5, Section 1-4; pages 110-126 Exercise 5.20 • What are their z­scores? [(y­y)/s] o Feb z= (6.73­2.324) / 1.577 = 2.79 o June = (3.93­0.857)/0.795 = ...

Statistics
Statistics 1770
John Sheriff
##### September 23.docx

September 23, 2013 Chapter 4, Secton 13, Pages 8289 Measuring Spread Each observation is associated with a deviation Std. Deviation gives a measure of spreadvariation by summarizing deviations: o Taking average of deviatio...

Statistics
Statistics 1770
John Sheriff
##### October 7.docx

October 7, 2013 Chapter 7, Sec 1­7, 178­196 Chapter 7­ Least squares Regression: “Line of Best Fit” • If relationship between two quantitative variables has a  straight­line pattern, we can extend our analy...

Statistics
Statistics 1770
John Sheriff
##### Statistics 1770 Lecture Notes - Miscarriage

Sept 11, 2013 Chapter 2, sec 1­2 pages 15­29 Youth Risk Behaviour Example • Who? o Teenagers in US • What? o Variables­ Sex, Grades, Day since Cigarette, Days since last drink, how  ...

Statistics
Statistics 1770
John Sheriff
##### October 4.docx

October 4, 2013 Chapter 4, Section 4, pgs 89­92 Chapter 6, Section 1­3 pg 149­161 Chapter 7, Section 1­7 pg 178­196 Excersize 6.16 •  Graph 1  o Positive relationship ...

Statistics
Statistics 1770
John Sheriff
##### September 30.docx

September 30, 2013 Chapter 5 Sec 1­4; pgs 110­126 Chapter 6 Sec 1­4, pgs 149­165 Finding Normal  Percentiles • N(1152 ,82)  o (Mean,  SD)  • A) Over 1250 o Z= (1250­1152) / ...

Statistics
Statistics 1770
John Sheriff
##### September 20.docx

September 20, 2013 Chapter 3 Sec 3­8 Pages 51­66 Mean • Uses every observation • Affected by skewness/outliers • Nice statistical properties Median • Ignores most observations • Not greatly affe...

Statistics
Statistics 1770
John Sheriff
##### September 18.docx

September 18, 2013 Chpt 2 Sec 1­4 Pages 43­54, 57­66 Other graphical summaries of Quantitative Data • Dot Plot o Each observation represented by a dot placed above its value on a number  lin...

Statistics
Statistics 1770
John Sheriff
##### Sept 13.docx

Sept 13, 2013 Chapter 2, Section 2, Pages 18-29 Evidence of an Association (Dependence) • Two variables have an association, or relationship, if a particular value for one  variable is mo...

Statistics
Statistics 1770
John Sheriff
##### Statistics 1770 Lecture Notes - Histogram, Unimodality

Sept 16, 2013 Chapter 3, Sec 1­4, pages 43­54, 57­66 Graphing Quantitive Data • Histogram o Essentially just graphical  display of the (binned)  frequency table o Di...

Statistics
Statistics 1770
John Sheriff
##### Statistics 1770 Lecture Notes - Scatter Plot

October 2, 2013 Chapter 4, Sec 4, pgs 89­92 Chapter 3, Sec 1­3, pgs 149­161 Chapter 6­ Association between Quantitative Variables • What variables might be related/associated with what kind of gas mileage a  ...

Statistics
Statistics 1770
John Sheriff
##### Statistics 1770 Lecture Notes - Unimodality, Standard Deviation, Interquartile Range

Sept 16, 2013 Chapter 3, Sec 1-4, pages 43-54, 57-66 Graphing Quantitive Data  Histogram o Essentially just graphical display of the (binned) frequency table o Divid...

Statistics
Statistics 1770
John Sheriff
##### Statistics 1770 Lecture Notes - Magnet School, Contingency Table, Frequency Distribution

Sept 13, 2013 Chapter 2, Section 2, Pages 18-29 Evidence of an Association (Dependence)  Two variables have an association, or relationship, if a particular value for one variable is mor...

Statistics
Statistics 1770
John Sheriff
##### Statistics 1770 Lecture Notes - Caffeine, Miscarriage, Contingency Table

Sept 11, 2013 Chapter 2, sec 1-2 pages 15-29 Youth Risk Behaviour Example  Who? o Teenagers in US  What? o Variables- Sex, Grades, Day since Cigarette, Days since last drink, how ...

Statistics
Statistics 1770
John Sheriff
##### Statistics - Reference Guides

This Guide provides an easy to follow summary of all basic principles that are the foundation to Statistics and Probabilities. Using a combination of charts and sample equations, the key concepts are developed and the esse...

Econometrics
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