Stat200-lecture1Aug31Fl09Sect1-4_web

# Stat200-lecture1Aug31Fl09Sect1-4_web - Descriptive Methods...

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1 Descriptive Methods: Quantitative Data Stat 200 Sections 1-4 Mon Aug 31, 2009 Do LQ1 after class

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2 Announcements Lecture Quiz 1 (LQ1): Take between after class and & 4:00 AM Tues HW1 Problems are listed on Week 2 Agenda. Submit answers between Thurs 12:30 PM & Friday 4:00 AM Thurs Sept 2 (review & understand slides at the end of this lecture – refer to textbook if necessary) Tues Sept 8: Lecture will be given in lab (bring powerpoint)
3 PreTest Question: Did you get this correct? Which of the following is be true: when considering salaries in a company employing 10 factory workers and 2 highly paid executive? A. mean > median (77%) B. mean < median (18%) C. mean ≈ median (5%)

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4 Breakdown of Statistical Methods Statistical Methods Descriptive Methods Inferential Methods Graphs Numbers Confidence Intervals Hypothesis Tests (P-values) Describe Samples Do Later
5 One Categorical Response Variable Descriptive Methods

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6 Breakdown of Descriptive Statistical Methods for Quantitative Data Descriptive Methods Graphs Numbers Measures of Center Measures of Spread Do Now
7 Graphs for Quantitative Data 5 4 3 2 1 Number_Classes Dotplot of Number_Classes 5 4 3 2 1 Number_Classes Boxplot of Number_Classes 5 4 3 2 1 40 30 20 10 0 Number_Classes Percent Histogram of Number_Classes Question: How many classes are you taking this summer session?

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8 Example 1: Histogram Versus Bar Chart Yes No 80 70 60 50 40 30 20 10 0 PA-resident Percent Chart of PA-resident Bar Chart 14 12 8 6 4 2 0 Computer_Hours Histogram of Computer_Hours Histogram Are you are PA resident? How many hrs/day do you spend on the computer?
9 Example 1: Histogram Basics 14 12 10 8 6 4 2 40 30 20 0 Computer_Hours Percent 1 2 11 21 36 23 6 Histogram of Computer_Hours 15 13 9 7 5 3 1 0 Computer_Hours 1 2 6 Midpoints Boundaries On the computer, what percent of students spend _____ 1. at most 3 hours/day? 2. at least 11 hours/day?

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10 Reference: Matching Symbols to “Words” Symbol Acceptable Words > greater than, more than, exceeds, larger than, above , longer than greater than or equal to, at least, not less than < less than, smaller than, below less than or equal to, at most , not more than
11 Histograms: Shape Terms 1. Mound (bell-shape/symmetric) 1. Right or Positively Skewed: 3. Left or Negatively Skewed :

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12 Example 2: Histograms Title: Companies get creative to boost CEOs’ pay Source: USA TODAY, May 4, 2009
13 Example 2A: Histogram Sample: CEO compensation for the 50 largest companies Sample Sorted (Total Comp in million \$): 0 1.9 5.2 5.4 5.7 6.6 7.9 8.3 8.7 9.0 9.2 10.2 11.0 11.3 12.1 34.0 35.7 36.1 36.9 37.2 38.2 42.8 42.9 51.1 104.4 113.0 Histogram Shape?

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## This note was uploaded on 09/15/2009 for the course STAT 200 taught by Professor Barroso,joaor during the Fall '08 term at Penn State.

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Stat200-lecture1Aug31Fl09Sect1-4_web - Descriptive Methods...

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