# Week 1 - STAT 218 Week#1 Introduction and Chapter 2 3...

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STAT 218 Week #1 Introduction and Chapter 2 / 3 Introductions Les Wait List sign in Syllabus o Office Hours, book, etc o Grading/Tests o Homework o Lecture Notes o Math vs Statistics - Concepts o Break/no-break Class Introductions - Name and Major The Key Questions! What is Statistics? Why do we need to understand it? When would I ever use it? Why am I here? Motivation How many whales are left in the world? Who is a better baseball player? If my friend has a choice between two diet programs which program should I encourage her/him to take? What are my chances/probability of getting sick if I engage in risky behavior? How do I fit in? ........ height, weight, clothes How many ears of corn will I be able to sell next year? How much money will I make in 5 years? Will I get skin cancer if I do not use sun screen? Probability? Etc. Misuse How many of you expect this to be your favorite class at Cal Poly How many of you expect this to be your favorite class that you take at 3:10/5:10 on Mon/Wed of this quarter o News Flash..…Survey of Cal Poly students indicates their favorite class is Statistics..….. Train minds - open minded….use data to think and act unbiased Do solid research and intelligently question the research findings of others. 1

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Chapter 2 – Cover all except Estimating Standard Deviation (SD) from a histogram (pg 47), Section 2.7 DATA Simple Tabulation of Data - College Majors in this Class Frequency table o frequency o fraction or relative frequency o percent frequency This is a Frequency Table Dot Plot Bar Chart These data summarized a VARIABLE VARIABLE – A CHARACTERISTIC OF A PERSON OR THING THAT CAN BE ASSGNED A NUMBER OR CATEGORY Class Major was the variable; Freshman, Sophomore, etc were the responses Frequency Distributions FREQUENCY is the number of occurrences of each value in the data set FREQUENCY DISTRIBUTION is a display of the frequency, or number of occurrences of each value in the data set (e.g: College Majors presented earlier) The RELATIVE FREQUENCY is just the frequency divided by the sample size Class Survey – Number Hours Listening to Music/week CLASS EXERCISE Prepare Frequency Tables Bar Chart Dot Plot Other Examples of Variables (and responses) Favorite type of music (jazz, country, rock) Number of brothers and sisters (0, 1, 2, etc) Time it takes you to drive to your home (10, 20 minutes, etc) Types of Variables – Classify each variable using 4 criteria Categorical ?
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