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## chapter 1 and 2 notes

1 review
by: Tarryanna robinson

109

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# chapter 1 and 2 notes STAT 208

Tarryanna robinson
NIU
Basic Statistics
Staff

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this is chapter 1 and 2 of the class it is covering frequency, relative frequency, marginal distribution and conditional distribution
COURSE
Basic Statistics
PROF.
Staff
TYPE
Class Notes
PAGES
3
WORDS
KARMA
25 ?

## 1

1 review
"You can bet I'll be grabbing Tarryanna studyguide for finals. Couldn't have made it this week without your help!"
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## Popular in Mathematics (M)

This 3 page Class Notes was uploaded by Tarryanna robinson on Saturday August 29, 2015. The Class Notes belongs to STAT 208 at Northern Illinois University taught by Staff in Spring 2015. Since its upload, it has received 109 views. For similar materials see Basic Statistics in Mathematics (M) at Northern Illinois University.

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## Reviews for chapter 1 and 2 notes

You can bet I'll be grabbing Tarryanna studyguide for finals. Couldn't have made it this week without your help!

-Jamey Wunsch

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Date Created: 08/29/15
Chapter 1 Statistics is a way of reasoning the goal is to help us understand the world Art of science of collecting and analyzing data Data is any collection of number characteristics or other items that provide info What is data Numerical Quantitative numbers price and age Categorical name ID number zip code area code state purchase choice qualitative Variable is characteristics recorded about each individual Data Analysis is context telling a story who what when where How Case an individual about whom we have data Population is all the individuals we wish to study Sample cases we actually collect data on How we collect the data is the difference between insight and nonsense Example worthless data voluntary survey and internet survey 5 W s who what when where why and How 23 in book chapter 1 who arby s sandwhich case each sandwhich what type of meat and number of calories serving size when no data where arby s why determine nutritional value How reported by Arby s Variable meat categorical calories quantitative serving size quantitative Chapter 2 Displaying and describing categorical Data 0 Labels types year in school blood type gender state name count the number of each unit of each type 0 Frequency count data 0 Frequency table type and counttype 0 Relative Frequency replacing the counts on the vertical axis with the percentage of the total number of cases falling in each ben Movie Type Frequency count Action 35 Comedy 37 Drama 27 Thriller 20 Make a bar chart for the categorical data 0 More working with data 0 Example summer of stats 208 summer class students by yeah Label Frequency Relative Frequency Freshmen 2 08 Sophomore 4 16 Junior 6 24 Senior 3 12 Graduate 10 40 25 100 make sure relative frequency is checked with 100 accuracy 22508 8 freshmen 4251616 sophomore 6252424 junior Rules of Data Analvsis Make a picture revea patterns that are not shown in raw numbers show important features and patterns data piles up and can show how cases distribute among categories make a frequency table make a relative frequency table 0 Area Principle is the area shown on the graph should correspond to the magnitude of data it represents make a bar chart or pie chart or categorical variables check add to 100 check scale of all plots Contingency table table that shows how the individuals are distributed along each variable contingent on the value of the other variable Marginal Distribution Frequency of the variables look at table in the book page 18 Conditional Distribution show the distribution of 1 variable for just those cases that satisfy a condition on another variable

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