L1-ss - The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
5/10/11 Lecture 1 1 STOR 155 Introductory Statistics Lecture 1: Overview; Displaying Distributions with Graphs The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL
Background image of page 1

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

View Full DocumentRight Arrow Icon
5/10/11 Lecture 1 2 Tip: Strategy for Success Stay active/involved in class. Ask questions during class (especially if you do not understand something). Answer questions to help other students if you can. Keep pace with the lectures, review daily, do homework after each lecture to help understand the materials. Make effective use of office hours (Instructor), open tutorial sessions, UNC Learning Center. – Help you answer questions about homework and lectures – Private time vs. public time
Background image of page 2
5/10/11 Lecture 1 3 What is Statistics ? Statistics : the science of collecting, organizing, analyzing and interpreting data (= information) Inference about population (using statistical tools) Population Sample of data
Background image of page 3

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

View Full DocumentRight Arrow Icon
5/10/11 Lecture 1 4 SAT Scores Some parents and teachers have been concerned about the trend of declining SAT scores … Question: effect of classroom atmosphere ( strict or liberal ) ? To answer the question, 50 students (24 males and 26 females) participated in a study on their performance, as measured by SAT scores at the end of the school year. The students were divided into two groups of 25 each (12 males and 13 females), with Group 1 to study under a strict atmosphere while Group 2 under a very permissive atmosphere. They were matched according to socio-economic background.
Background image of page 4
5/10/11 Lecture 1 5 SAT Scores • After 9 months, all students were given the same standardized tests: verbal and math. Student Group Gender SATMath SATVer A Strict F 670 700 B Strict M 700 680 C Liberal F 750 730 D Liberal M 690 750
Background image of page 5

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

View Full DocumentRight Arrow Icon
5/10/11 Lecture 1 6 SAT Scores • This example involves data collection , data analysis , and statistical inference . – How? • Questions: – Does stricter classroom atmosphere increase the average score? – Why “matched according to socio-economic background”? – Why “12 males and 13 females per group”? – Is the group size 50 large enough to make a confident conclusion?
Background image of page 6
5/10/11 Lecture 1 7 Fundamental Concepts Population : the entire group of individuals that we want information about. – Students (who are about to take SAT)
Background image of page 7

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

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/18/2011 for the course STOR 155 taught by Professor Andrewb.nobel during the Summer '08 term at UNC.

Page1 / 30

L1-ss - The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL...

This preview shows document pages 1 - 8. Sign up to view the full document.

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